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7x-45=15x+107
We move all terms to the left:
7x-45-(15x+107)=0
We get rid of parentheses
7x-15x-107-45=0
We add all the numbers together, and all the variables
-8x-152=0
We move all terms containing x to the left, all other terms to the right
-8x=152
x=152/-8
x=-19
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