2乘以(X+12.5)=34
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2乘以(X+12.5)=34
2乘以(X+12.5)=34
2乘以(X+12.5)=34
2乘以(X+12.5)=34
2x+25=34
2x=34-25
2x=9
x=4.5
2(x+12.5)=34
2x+25=34
2x=9
x=4.5
2乘以(X+12.5)=34
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