Question

1) Resolva as equações:
a) x+7=10
b) x+8=3
c) 4x=28
d) 2x-3=7

Answer 1

$x + 7 = 10 \\ x = 10 - 7 \\ x = 3$

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

$4x = 28 \\ x = \frac{28}{4} \\ \: \: \: \: \: \: \: \: \: \: x = 7$

$2x - 3 = 7 \\ 2x = 7 + 3 \\ 2x = 10 \\ x = \frac{10}{2} = 5$