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7x+1=8x-15
We move all terms to the left:
7x+1-(8x-15)=0
We get rid of parentheses
7x-8x+15+1=0
We add all the numbers together, and all the variables
-1x+16=0
We move all terms containing x to the left, all other terms to the right
-x=-16
x=-16/-1
x=+16
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