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45=4x-27
We move all terms to the left:
45-(4x-27)=0
We get rid of parentheses
-4x+27+45=0
We add all the numbers together, and all the variables
-4x+72=0
We move all terms containing x to the left, all other terms to the right
-4x=-72
x=-72/-4
x=+18
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