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71=9-4x
We move all terms to the left:
71-(9-4x)=0
We add all the numbers together, and all the variables
-(-4x+9)+71=0
We get rid of parentheses
4x-9+71=0
We add all the numbers together, and all the variables
4x+62=0
We move all terms containing x to the left, all other terms to the right
4x=-62
x=-62/4
x=-15+1/2
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