Question

me ajuda 9x-4x +10=7x-30

Answer 1

9x - 4x - 7x = - 30 - 10
5x - 7x = - 40
-2x = - 40 (inverter os sinais )
2x = 40
x = 40 /2
x = 20

Answer 2

9x-4x+10=7x-30

9x-4x-7x=-30-10

-2x=-40

x=-40/-2

x=20

Confirmando o valor de x encontrado

9x-4x+10=7x-30

9*20-4*20+10=7*20-30

180-80+10=140-30

100+10=110

110 = 110