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71=9x-37x=12
We move all terms to the left:
71-(9x-37x)=0
We add all the numbers together, and all the variables
-(-28x)+71=0
We get rid of parentheses
28x+71=0
We move all terms containing x to the left, all other terms to the right
28x=-71
x=-71/28
x=-2+15/28
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