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72+x=0.12x
We move all terms to the left:
72+x-(0.12x)=0
We add all the numbers together, and all the variables
x-(+0.12x)+72=0
We get rid of parentheses
x-0.12x+72=0
We add all the numbers together, and all the variables
0.88x+72=0
We move all terms containing x to the left, all other terms to the right
0.88x=-72
x=-72/0.88
x=-81+0.72/0.88
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