Hallar el valor de x para que cada expresion sea verdadera ?

Hallar el valor de x para que cada expresiónsea verdadera

a.

)<img src="https://tex.z-dn.net/?f=%5Cleft%7Cx%5Cright%7C%3D15%0A%0Ax%3D-15%5Cquad%20%5Cmathrm%7Bor%7D%5Cquad%20%5C%3Ax%3D15" />

b)<img src="https://tex.z-dn.net/?f=%5Cleft%7C-3%5Cright%7C%3Dx%0A%0Ax%3D3" />

c)<img src="https://tex.z-dn.net/?f=%5Cleft%7C-x%5Cright%7C%3D7%0A%0Ax%3D-7%5Cquad%20%5Cmathrm%7Bor%7D%5Cquad%20%5C%3Ax%3D7" />

d)<img src="https://tex.z-dn.net/?f=%5Cleft%7Cx%5Cright%7C%3D0%0A%0A%0Af%5Cleft%28x%5Cright%29%7C%3D%5C%3A0%5Cquad%20%5CRightarrow%20%5C%3Af%5Cleft%28x%5Cright%29%3D0%0A%0Ax%3D0%0A%0A%0A" />

e)<img src="https://tex.z-dn.net/?f=%5Cleft%7C8%5Cright%7C%3Dx%0A%0Ax%3D8" />

f)<img src="https://tex.z-dn.net/?f=%5Cleft%7C-%5Cleft%28-13%5Cright%29%5Cright%7C%3Dx%0A%0A%5Cmathrm%7BAplicar%5C%3Ala%5C%3Aregla%7D%5C%3A-%5Cleft%28-a%5Cright%29%3Da%0A%0Ax%3D%5Cleft%7C13%5Cright%7C%0A%0A%5Cmathrm%7BAplicar%5C%3Alas%5C%3Apropiedades%5C%3Ade%5C%3Alos%5C%3Avalores%5C%3Aabsolutos%7D%3A%5Cquad%20%5Cleft%7Ca%5Cright%7C%3Da%2C%5C%3Aa%5Cge%200%0A%0Ax%3D13" />

g)<img src="https://tex.z-dn.net/?f=%5Cleft%7Cx-3%5Cright%7C%3D12" /> <img src="https://tex.z-dn.net/?f=f%5Cleft%28x%5Cright%29%7C%3Da%5Cquad%20%5CRightarrow%20%5C%3Af%5Cleft%28x%5Cright%29%3D-a%5Cquad%20%5Cmathrm%7Bor%7D%5Cquad%20%5C%3Af%5Cleft%28x%5Cright%29%3Da" />

<img src="https://tex.z-dn.net/?f=x-3%3D-12%0A%0Ax%3D-9" />

<img src="https://tex.z-dn.net/?f=x-3%3D12%0A%0Ax%3D15" />

[img = 10]

h)[img = 11].