Question

Observe o exemplo e resolva as equações em Q

Answer 1

Explicação passo-a-passo:

1 )

$x + 30 = 40$

$x = 40 - 30$

$x = \red{10}$

2 )

$30 - 20 + 2x = 10$

$10 + 2x = 10$

$2x = 0$

$x = \red{0}$

3 )

$3x-10 +13 = -2x + 28$

$3x + 2x = 28 + 10 - 13$

$5x = 25$

$x = \dfrac{25}{5}$

$x = \red{5}$

4 )

$20x - 30 = 40 + 30 - 20$

$20x = 40 + 30 - 20 + 30$

$20x = 80$

$x = \dfrac{80}{20}$

$x = \red{4}$

5 )

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

$-5x - 44 = -49$

$-5x = - 49 + 44$

$- 5x = - 5$

$x = -\dfrac{5}{5}$

$x = \red{1}$

6 )

$10x -12 + 10 = 18 - 20$

$10x -2 = - 2$

$10x = - 2 + 2$

$10x = 0$

$x = \red{0}$

7 )

$13x - 23 - 45 = -7x + 12$

$13x - 68 = -7x + 12$

$13x + 7x = 12 + 68$

$20x = 80$

$x = \dfrac{80}{20}$

$x = \red{4}$

Espero ter ajudado !!!