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(36+x)/(6+x)=4 36+x=4(6+x) 36+x=24+4x 4x-x=36-24 3x=12 x=4
4*36-2(12+x)=36 144-(24+2x)=36 144-24-36=2x 2x=84 x=84÷2 x=42
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