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XX7/9=140
We move all terms to the left:
XX7/9-(140)=0
We multiply all the terms by the denominator
XX7-140*9=0
We add all the numbers together, and all the variables
XX7-1260=0
We move all terms containing X to the left, all other terms to the right
XX7=1260
X=1260/1
X=1260
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