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7.2+2.4x=81.12
We move all terms to the left:
7.2+2.4x-(81.12)=0
We add all the numbers together, and all the variables
2.4x-73.92=0
We move all terms containing x to the left, all other terms to the right
2.4x=73.92
x=73.92/2.4
x=30+1/1.25
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