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5x+15=-7x+63x
We move all terms to the left:
5x+15-(-7x+63x)=0
We add all the numbers together, and all the variables
5x-(+56x)+15=0
We get rid of parentheses
5x-56x+15=0
We add all the numbers together, and all the variables
-51x+15=0
We move all terms containing x to the left, all other terms to the right
-51x=-15
x=-15/-51
x=5/17
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