Respostas
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A) x/3+4x=39
x/3+4x/1=39/1
x/3+4x/3=39/3
1.x+4x.3=39.3
1x+12x=117
13x=117
x= 117/13
x= 9
B) x+x/2=12
x/1+x/2=12/1
x/2+x/2=12/2
2.x+1.x=12.2
2x+1x=24
3x=24
x=24/3
x=8
C) x/4-1=2+x/10
x/4-1/1=2/1+x/10
x/20-1/20=2/20+x/20
x.5-20.1=2.20+x.2
5x-20=40+2x
5x-2x=40+20
3x=60
x=60/3
x=20
x/3+4x/1=39/1
x/3+4x/3=39/3
1.x+4x.3=39.3
1x+12x=117
13x=117
x= 117/13
x= 9
B) x+x/2=12
x/1+x/2=12/1
x/2+x/2=12/2
2.x+1.x=12.2
2x+1x=24
3x=24
x=24/3
x=8
C) x/4-1=2+x/10
x/4-1/1=2/1+x/10
x/20-1/20=2/20+x/20
x.5-20.1=2.20+x.2
5x-20=40+2x
5x-2x=40+20
3x=60
x=60/3
x=20
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