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15=7-5x+3
We move all terms to the left:
15-(7-5x+3)=0
We add all the numbers together, and all the variables
-(-5x+10)+15=0
We get rid of parentheses
5x-10+15=0
We add all the numbers together, and all the variables
5x+5=0
We move all terms containing x to the left, all other terms to the right
5x=-5
x=-5/5
x=-1
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