Resposta :
Resposta:
a)22
b)7,666...
c)50
d)56
e)28
f)25
Explicação passo-a-passo:
a)2x+43=87
2x=87-43
2x=44
x=44÷2
x=22
b)3x-19=42
3x=42-19
3x=23
x=23÷3
x=7,666...
c)x+2x=150
3x=150
x=150÷3
x=50
d)x+28=3×28
x+28=84
x=84-28
x=56
e)x+13=41
x=41-13
x=28
f)2x+3x=125
5x=125
x=125÷5
x=25