Respostas

2014-08-26T18:48:10-03:00
2x=24-1x
2x + 1x=24
3x=24
x=24÷3
x=8


3x=20-2x
3x+2x=20
5x=20
x=20÷5
x=4


2x+10=20
2x=20-10
2x=10
x=10÷2
x=5