Question

URGENTE 9+2.(5X-4)=21

Answer 1

9 +2.(5x - 4) = 21
Faça a distributiva:
9 +2.5x +2.(-4) = 21
9 +10x  -8 = 21
10x = 21 +8 -9
10x = 20
x = $\frac{20}{10}$ (corte os zeros)
x = $\frac{2}{1}$
x = 2

Answer 2

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

9 + 10x - 8 = 21

10x = 21 - 9 + 8

10x = 20

x = 20/10

x = 2