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5x-2.5x=7.5
We move all terms to the left:
5x-2.5x-(7.5)=0
We add all the numbers together, and all the variables
2.5x-7.5=0
We move all terms containing x to the left, all other terms to the right
2.5x=7.5
x=7.5/2.5
x=3
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