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-30x+25=-31x+43.5
We move all terms to the left:
-30x+25-(-31x+43.5)=0
We get rid of parentheses
-30x+31x-43.5+25=0
We add all the numbers together, and all the variables
x-18.5=0
We move all terms containing x to the left, all other terms to the right
x=18.5
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