Question

AYUDAA
a 3.(4-x)-5x=2.(x+1)
b 6x-2.(x+4)=-100:4+x+2
c 5.(x-1)-3.(2x-4)=5x-5

Answer 1

a)

$3 \times (4 - x) - 5x = 2 \times (x + 1) \\ 12 - 3x - 5x = 2x + 2 \\ 12 - 8x = 2x + 2 \\ - 8x - 2x = 2 - 12 \\ - 10x = - 10 \\ x = - 10 \div ( - 10) \\ x = 1$

b)

$6x - 2 \times (x + 4) = - 100 \div 4 + x + 2 \\ 6x - 2x - 8 = - 25 + x + 2 \\ 4x - 8 = - 23 + x \\ 4x - x = - 23 + 8 \\ 3x = - 15 \\ x = - 15 \div3 \\ x = - 5$

c)

$5 \times (x - 1) - 3 \times (2x - 4) = 5x - 5 \\ 5x - 5 - 6x + 12 = 5x - 5 \\ - 1x + 7 = 5x - 5 \\ - 1x - 5x = - 5 - 7 \\ - 6x = - 12 \\ x = - 12 \div ( - 6) \\ x = 2$