2x+3x+9=8(6-x)
2x+3x+9=48-8x
2x+3x+8x=48-9
13x=39
x=39/13
x=3
Resposta: 3
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2x+3x+9=8(6-x)
2x+3x+9=48-8x
2x+3x+8x=48-9
13x=39
x=39/13
x=3
Resposta: 3