Question

Resolva as equações abaixo:
a)2x+1=x+7
b)5x-2x=9+9
c)7x-11=-2x+10

Answer 1

a)
2x+1=x+7
2x-x=7-1
x=6

b)
5x-2x=9+9
3x=18
x=18/3
x=6

c)
7x-11=-2x+10
7x+2x=10+11
9x=21
x=21/9
x=7/3

Answer 2

a:2X-X=7-1
x =6
b:3X=18
X=18/3
X=6
c:7X+(-2X)=10+11
9X=21
X=21/9
Simplificando :21/9 ÷3=7/3