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15x+3x=82.5
We move all terms to the left:
15x+3x-(82.5)=0
We add all the numbers together, and all the variables
18x-82.5=0
We move all terms containing x to the left, all other terms to the right
18x=82.5
x=82.5/18
x=4+4.2/7.2
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