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7.5x+15=13.5+15
We move all terms to the left:
7.5x+15-(13.5+15)=0
We add all the numbers together, and all the variables
7.5x+15-(28.5)=0
We add all the numbers together, and all the variables
7.5x-13.5=0
We move all terms containing x to the left, all other terms to the right
7.5x=13.5
x=13.5/7.5
x=1+6/7.5
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