Question

como calcular essa essa equação
-2x-3x=-15-8
-4(x-1)+8(x+2)=2(5x10)
4x-x=40-10

Answer 1

$Resolu\c{c}\~oes \to \left\{\begin{array}{ccc}-2x-3x=-15-8\\-5x = -23\\5x=23\\\boxed{\boxed{x= \frac{23}{5} }}\\\\-4*(x-1)+8*(x+2)=2*(5x+10)\\-4x+4+8x+16=10x+20\\-4x+8x-10x = 20-4-16\\-6x=0\\\boxed{\boxed{x=0}}\\\\4x-x=40-10\\3x = 30\\\boxed{\boxed{x = 10}}\end{array}\right$

Obs: * = multiplicação.

Espero ter ajudado. :))

Answer 2

a) 
- 2x - 3x = - 15 - 8
- 5x = - 23 ( - 1)
5x = 23
x = 23/5
x = 4,6

b)
- 4 (x - 1) + 8 (x+ 2) = 2(5x + 10)
- 4x + 4  + 8x + 16 = 10x + 20
- 4x + 8x -10x = 20 - 16 - 4
- 6x = 0
x = 0

c)
4x - x=40 -10
3x =30
x =30/3
x = 10