Primera
5 (x - 1) + 16 (2x + 3) = 3 (2x - 7) - x
5x - 5 + 32x + 48 = 6x - 21 - x
37x + 43 = 5x - 21
37x - 5x = - 21 - 43
32x = - 64
x = - 64 / 32
x = - 2
Comprobación
x = - 2
5 (x - 1) + 16 (2x + 3) = 3 (2x - 7) - x
5x - 5 + 32x + 48 = 6x - 21 - x
37x + 43 = 5x - 21
37( - 2) + 43 = 5( - 2) - 21 - 74 + 43 = - 10 - 21 - 31 = - 31
Segunda
5 - 4(3x + 1) = 1 + 4(2x + 20)
5 - 12x - 4 = 1 + 8x + 80 - 12x + 1 = 8x + 81 - 12x - 8x = 81 - 1 - 4x = 80
x = 80 / - 4
x = - 20
Comprobación
x = - 20
5 - 4(3x + 1) = 1 + 4(2x + 20)
5 - 12x - 4 = 1 + 8x + 80 - 12x + 1 = 8x + 81 - 12( - 20) + 1 = 8( - 20) + 81
240 + 1 = 160 + 81
241 = 241
Tercera
3(x - 2) + x = 5(x - 3) + 9
3x - 6 + x = 5x - 15 + 9
4x - 6 = 5x - 6 - 6 + 6 = 5x - 4x
0 = x
Comprobación
x = 0
3(x - 2) + x = 5(x - 3) + 9
3x - 6 + x = 5x - 15 + 9
4x - 6 = 5x - 6
4(0) - 6 = 5(0) - 6 - 6 = - 6.