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x+65=8x-19
We move all terms to the left:
x+65-(8x-19)=0
We get rid of parentheses
x-8x+19+65=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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