1. 5 - X = 9 - X = 9 - 5 entonces - X = 4 multiplicamos por - 1 y da X = - 4
2.
3x + x - 7 = 1 4x = 1 + 7 entonces 4x = 8 pasamos a dividir el 4 x = 8 / 4 entonces x = 4
3.
5x - 2 = 3x + 4 5x - 3x = 4 + 2 entonces 2x = 6 pasamos a dividir el 2 x = 6 / 2 x = 3
4.
2(3 + x) = 10 6 + 2x = 10 entonces 2x = 10 - 6 2x = 4 pasamos a div el 2 x = 4 / 2 x = 2
5.
5(x + 2) = 4(2x + 2) 5x + 10 = 8x + 8 5x - 8x = 8 - 10 - 3x = - 2 x = - 2 / - 3 x = 2 / 3
6.
30 - (3x + 6) = 9 30 - 3x - 6 = 9 - 3x = 9 - 30 + 6 - 3x = - 15 x = - 15 / - 3 x = 5
7.
35 - (2x - 3) = 18 35 - 2x + 3 = 18 - 2x = 18 - 35 - 3 - 2x = - 20 x = - 20 / - 2 x = 10.