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A mathematical equation problem in the fifth grade of primary school
There are X one-dollar coins in Xiao Lin's piggy bank, so there are (145-X) fifty-cent coins.

X+0.5×( 145-X)= 127

X+72.5-0.5X= 127

X-0.5X= 127-72.5

0.5X=54.5

X= 109

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