Question

resolva as equações 7x+31=12 5x+21=8

Answer 1

7x=12-31
7x= -19
x=-19/7

5x=8-21
5x=-13
x=-13/5

Answer 2

7x+31=12

7x=12-31

7x=-19

$x=-\frac{19}{7}\\x= -2\frac{5}{7}$

x=2,7

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5x+21=8

5x=8-21

5x=-13

$x=-\frac{13}{5}$

Espero ter ajudado, melhor resposta pfv