Question

como se resolve??
-x-5+4x=-7x+8-3x
3x-2x=13x+2
2-4x=32-18x+12
2x-1=-3+x+4

Answer 1

Resposta: 1, -2/12, 3 e 2.


Cálculo:

A) -x-5+4x= -7x+8-3x
-x+4x-5= -7x-3x+8
3x-5= -10x+8
3x+10x= 8+5
13x= 13
x= 13/13
x= 1.

B) 3x-2x= 13x+2
x= 13x+2
x-13x= 2
-12x= 2 . (-1)
12x= -2
x= -2/12.

C) 2-4x= 32-18x+12
2-32= -18x+4x+12
-30= -14x+12
-30-12= -14x
-42= -14x . (-1)
42= 14x
42/14= x
3= x.

D) 2x-1= -3+x+4
2x-x= -3+1+4
x= -2+4
x= 2.

Answer 2

A) - x - 5 + 4x = - 7x + 8 - 3x
- x + 4x + 7x + 3x = 8 + 5
3x + 10x = 13
13x = 13
x = 13/13
x = 1

B)3x - 2x = 13x + 2
3x - 2x - 13x = 2
x - 13x = 2
- 12x = 2 (- 1)
12x = - 2
x = - 2/12(÷ 2)
x = - 1/6

C) 2 - 4x = 32 - 18x + 12
- 4x + 18x = 32 + 12 - 2
14x = 44 - 2
14x = 42
x = 42/14
x = 3

D) 2x - 1 = - 3 + x + 4
2x - x = - 3 + 4 + 1
x = 1 + 1
x = 2