Question

alguel pode me ajudar?​

Answer 1

Resposta:

b) x - 4 = 3

<=> x = 3 + 4

<=> x = 7

c)

$3x = 15 \\ x = \frac{15}{3} \\ x = 5$

$d)7x = - 21 \\ x = \frac{ - 21}{7} \\ x = - 3$

$e)13x = 13 \\ x = \frac{13}{13} \\ x = 1$

$f)6x = 2x + 16 \\ 6x - 2x = 16 \\ 4x = 16 \\ x = \frac{16}{4} \\ x = 4$

$g)2x - 5 = x + 1 \\ 2x - x = 1 + 5 \\ x = 6$

$h)5x + 7 = 4x + 10 \\ 5x - 4x = 10 - 7 \\ x = 3$

$i)3(x - 2) = 2x - 4 \\ 3x - 6 = 2x - 4 \\ 3x - 2x = - 4 + 6 \\ x = 2$

$j)2(x - 1) = 3x + 4 \\ 2x - 2 = 3x + 4 \\ 2x - 3x = 4 + 2 \\ - x = 6 \: | \times ( - 1) \\ x = - 6$

$k)3(x - 1) - 7 = 15 \\ 3x - 3 - 7 = 15 \\ 3x - 10 = 15 \\ 3x = 15 + 10 \\ 3x = 25 \\ x = \frac{25}{3}$

$l)7(x - 4) = 2x - 3 \\ 7x - 28 = 2x - 3 \\ 7x - 2x = - 3 + 28 \\ 5x = 25 \\ x = \frac{25}{5} \\ x = 5$

$m)3(x - 2) = 4(3 - x) \\ 3x - 6 = 12 - 4x \\ 3x + 4x = 12 + 6 \\ 7x = 18 \\ x = \frac{18}{7}$

$n)2x + 5 - 5x = - 1 \\ 2x - 5x = - 1 - 6 \\ - 3x = - 7 | \times ( - 1) \\ 3x = 7 \\ x = \frac{7}{3}$

$o)5 + 6x = 5x + 2 \\ 6x - 5x = 2 - 5 \\ x = - 3$

$p)x + 2x - 1 - 3 = x \\ x + 2x - x = 1 + 3 \\ 2x = 4 \\ x = \frac{4}{2} \\ x = 2$