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10.5+1.5x=15
We move all terms to the left:
10.5+1.5x-(15)=0
We add all the numbers together, and all the variables
1.5x-4.5=0
We move all terms containing x to the left, all other terms to the right
1.5x=4.5
x=4.5/1.5
x=3
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