Question

resolva as equações: 7y+5-y+8=31

Answer 1

$7y+5-y+8=31\to \\\\ 7y-y=31-5-8\to \\\\ 6y=18\to \\\\ y= \frac{18}{6} \to \\\\y=3$

Answer 2

7y+5-y+8=31
7y-y=31-5-8
6y=18
y=18/6
y=3