Question

Resolvam pra mim essas equaçoēs pfv é pra amanhã !!!!

A)8x-3=5x+21
B)7x-21=3x+7
C)10x-137=9x-37

Answer 1

a) 8x-5x=21+3
3x=24
x= 24/3
x=8

b) 7x-3x=7+21
4x=28
x=7

c) 10x-9x=-37 +137
x= 100

Answer 2

a)   $8x-3=5x+21 \\ 8x-5x = 21 +3 \\ 3x = 24 \\ x = 24/3 \\ x= 8$ 

b)  $7x-21=3x +7 \\ 7x-3x = 7 +21 \\ 4x = 28 \\ x = 28/4 \\ x = 7$ 

c) $10x-137=9x-37 \\ 10x -9x = -37 +137 \\ x = 100$