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37.5-3.5x=4x-30
We move all terms to the left:
37.5-3.5x-(4x-30)=0
We get rid of parentheses
-3.5x-4x+30+37.5=0
We add all the numbers together, and all the variables
-7.5x+67.5=0
We move all terms containing x to the left, all other terms to the right
-7.5x=-67.5
x=-67.5/-7.5
x=+9
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