Question

Ajuda pelo amor de Deussss

Answer 1

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

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

$c)3x - 10 + 13 = - 2x + 28 \\ 3x + 2x = 28 + 10 - 13 \\ 5x = 25 \\ x = \frac{25}{5} \\ x = 5$

$d)20x - 30 = 40 + 30 - 20 \\ 20x = 40 + 30 - 20 + 30 \\ 20x = 80 \\ x = \frac{80}{20} \\ x = 4$

$e)- 5x + 45 - 89 = - 90 + 41 \\ - 5x = - 90 + 41 - 45 + 89 \\ - 5x = - 5 \\ - x = \frac{ - 5}{5} \\ - x = - 1 \times ( - 1) \\ x = 1$

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

$g)20 - 80 + 2x = 10 \\ 2x = 10 - 20 + 80 \\ 2x = 70 \\ x = \frac{70}{2} \\ x = 35$

$h)19 + 2x - 13 = 10 - 20 \\ 2x = 10 - 20 - 19 + 13 \\ 2x = - 16 \\ x = \frac{ - 16}{2} \\ x = - 8$

$i)10x - 12 + 10 = + 18 - 20 \\ 10x = 18 - 20 + 12 - 10 \\ 10x = 0 \\ x = \frac{0}{10} \\ x = 0$

$j)13x - 23 - 45 = - 7x + 12 \\ 13x + 7x = 12 + 23 + 45 \\ 20x = 80 \\ x = \frac{80}{20} \\ x = 4$