Question

qual o resultado de:

5 . (x+2) -3 . (x+6) =40

4x +2 . (13-x) =46

12x +21 =10x+16

7x (2x) =14

Answer 1

5.(x+2)-3.(x+6)=40
5x+10-3x-18=40
2x=40-10+18
2x=48
x=48:2
x=24
___________

4x+2.(13-x)=46
4x+26-2x=46
2x=46-26
2x=20
x=10
______________

12x+21=10x+16
12x-10x=16-21
2x=-5
x=-5/2
______________

7x(2x)=14
14x²=14
x²= 1
x=1