Question

Resolva as equações:a)×+5=8 b)×_4=3c)×_7=2×+5×_7=_7d)7×+8=4×_10​

Answer 1

Resposta:

a)

$x + 5 = 8 \\ x = 8 - 5 \\ x = 3$

b)

$x - 4 = 3 \\ x = 3 + 4 \\ x = 7$

c)

$x - 7 = 2x + 5x - 7 \\ x - 2x - 5x = - 7 + 7\\ - 8x = 0$

d)

$7x + 8 = 4x - 10 \\ 7x - 4x = - 10 - 8 \\ 3x = - 18 \\ x = - \frac{18}{3} = - 6$