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72=63-3x
We move all terms to the left:
72-(63-3x)=0
We add all the numbers together, and all the variables
-(-3x+63)+72=0
We get rid of parentheses
3x-63+72=0
We add all the numbers together, and all the variables
3x+9=0
We move all terms containing x to the left, all other terms to the right
3x=-9
x=-9/3
x=-3
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