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70+x+13=8x-1
We move all terms to the left:
70+x+13-(8x-1)=0
We add all the numbers together, and all the variables
x-(8x-1)+83=0
We get rid of parentheses
x-8x+1+83=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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