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x - 3x + 5x - x = 3 - 6 - 7 + 4
2x = 6
x = 6/2
x = 3
b) 2 por ( 1 - 3x) =bx - 5
2 - 6x = x - 5
-6x - x = -5 - 2
-7x = -7
x = -7/-7
x = 1
c) x - 3/ 4 = 9 - x / 2
x + x/2 = 9 + 3/4
3/2x = 39/4
x = 39/4/3/2
x = 78/12
x = 39/6