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a)
x + 7 = 12
x = 12 - 7
x = 5 ----> respuesta
b)
3x - 2 = 2(x - 1)
3x - 2 = 2x - 2
3x - 2x = - 2 + 2
x = 0 ----> respuesta
c)
4x - 2 = x - 6
4x - x = -6 + 2
3x = -4
x = -4/3 ----> respuesta
d)
5(x - 2) = 4 - x
5x - 10 = 4 - x
5x + x = 4 + 10
6x = 14
x = 14/6 ---> sacas mitad
x = 7/3 ----> respuesta