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1-3x=-7x-15
We move all terms to the left:
1-3x-(-7x-15)=0
We get rid of parentheses
-3x+7x+15+1=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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