Question

equação 1 °
a) 8x - (x + 3) = 11
b) 100x + 80 x = 120 x - (40 x - 300)
c) 9 - 3 ( 2x - 8 ) + (4 - 5 ) = 20 - 5 x - 2 x)

Answer 1

Olá!
a)
8x - (x+3) = 11
7x = 11-3
x = 8/7

b)
100x + 80x = 120x -40x -300
180x = 80x - 300
100x = -300
x = -3

c)
9 -6x +24 + 4 - 5 = 20 - 5x - 2x
9 +24 + 4 -5 -20 = 5x - 2x + 6x
12 = 11x
x= 12/11