Question

resolva as equações:
a) 3x+18=x+40
b) 2x+5x-30=80
c) 3x+x+40=80

Answer 1

a) 3x-x= 40-18
2x= 22
x=22÷2
x=11

b) 2x+5x-30=80
7x=30+80
7x=110
x= 110÷7
x=
$\frac{110}{7}$
c)3x+x+40=80
4x=40
x= 40÷4
x=10