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7+15=4x+66
We move all terms to the left:
7+15-(4x+66)=0
We add all the numbers together, and all the variables
-(4x+66)+22=0
We get rid of parentheses
-4x-66+22=0
We add all the numbers together, and all the variables
-4x-44=0
We move all terms containing x to the left, all other terms to the right
-4x=44
x=44/-4
x=-11
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