Question

Calcule x Pfff Preciso pra hj dou 28 pontos

Answer 1

1)

a)7x-10=x+20
7x-x=20+10
6x=30
x=30÷6
x=5

b)5x-10=3x+40
5x-3x=40+10
2x=50
x=50÷2
x=25

Espero ter ajudado,bons estudos,bjs!!!