Question

determine o valor de x

a) x + 1 += 10

×=10-1

×=9

b) 2x - 4 = 3 - 6 x
3×3×3
9


c) 2x + 10 = 20

d) 2 ( x + 1 ) = x + 10

Answer 1

Explicação passo-a-passo:

$x + 1 = 10 \\ x = 10 - 1 \\ x = 9 \\ \\ 2x - 4 = 3 - 6x \\ 2x + 6x = 3 + 4 \\ 8x = 7 \\ x = \frac{7}{8}$

$2x + 10 = 20 \\ 2x = 20 - 10 \\ 2x = 10 \\ x = \frac{10}{2} \\ x = 5 \\ \\ 2(x + 1) = x + 10 \\ 2x + 2 = x + 10 \\ 2x - x = 10 - 2 \\ x = 8$