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42.5+x+0.3x=140.26
We move all terms to the left:
42.5+x+0.3x-(140.26)=0
We add all the numbers together, and all the variables
1.3x-97.76=0
We move all terms containing x to the left, all other terms to the right
1.3x=97.76
x=97.76/1.3
x=75+0.26000000000001/1.3
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