Question

9+2.(5x-4)=21 ??
Qual a resposta? me ajudem please!

Answer 1

9 + 2.(5.x - 4) = 21

9 + 10.x - 8 = 21

10.x = 21 + 8 - 9

10.x = 20

x = 20/10

x = 2

Espero ter ajudado.

Answer 2

$9+2(5x-4)=21\\ 9+10x-8=21\\ 10x=21-9+8\\ 10x=20\\ x=20/10\\ x=2$