Question

Resolvendo equações.

X+30 = 40

30-20+2x=10

-5x+45-89= -90+41

10x-20=40+50

Answer 1

$x + 30 = 40 \\ x = 40 - 30 \\ x = 10$

$30 - 20 + 2x = 10 \\ 2x = 10 - 30 + 20 \\ 2x = 10 + 20 - 30 \\ 2x = 30 - 30 \\ 2x = 0 \\ x = \frac{0}{2} \\ x = 0$

$- 5x + 45 - 89 = - 90 + 41 \\ - 5x = - 90 + 41 - 45 + 89 \\ - 5x = - 90 - 45 + 41 + 89 \\ - 5x = - 135 + 130 \\ - 5x = - 5 .( - 1) \\ 5x = 5 \\ x = \frac{5}{5} \\ x = 1$

$10 \times - 20 = 40 + 50 \\ 10x = 40 + 50 + 20 \\ 10x = 110 \\ x = \frac{110}{10} \\ x = 11$