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-71-8x=-18x+19
We move all terms to the left:
-71-8x-(-18x+19)=0
We get rid of parentheses
-8x+18x-19-71=0
We add all the numbers together, and all the variables
10x-90=0
We move all terms containing x to the left, all other terms to the right
10x=90
x=90/10
x=9
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