Question

1- Resolva: a- 7X-4-x=-7X+8-3x

b- -X-5+4x=-7X+6X+15


C- 4X-4-5X=-6+90



D-10-9X+2X=2-3X​

Answer 1

Resposta:

a- 7X-4-x=-7X+8-3x

$7x - 4 - x + 7x - 8 + 3x = 0 \\ 4x - 12 = 0 \\ 4x = 12 \div (4) \\ x = 3$

b- -X-5+4x=-7X+6X+15

$- x - 5 + 4x + 7x - 6x - 15 = 0 \\ 4x - 20 = 0 \\ 4x = 20 \div (4) \\ x = 5$

C- 4X-4-5X=-6+90

$4x - 4 - 5x + 6 - 90 = 0 \\ - x - 88 = 0 \\ - x = 88 \times ( - 1) \\ x = - 88$

D-10-9X+2X=2-3X

$10 - 9x + 2x - 2 + 3x = 0 \\ 8 - 4x = 0 \\ - 4x = - 8 \times ( - 1) \\ 4x = 8 \div (4) \\ x = 2$