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8+7=6x+7x
We move all terms to the left:
8+7-(6x+7x)=0
We add all the numbers together, and all the variables
-(+13x)+8+7=0
We add all the numbers together, and all the variables
-(+13x)+15=0
We get rid of parentheses
-13x+15=0
We move all terms containing x to the left, all other terms to the right
-13x=-15
x=-15/-13
x=1+2/13
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