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71+5x=9x-13
We move all terms to the left:
71+5x-(9x-13)=0
We get rid of parentheses
5x-9x+13+71=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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