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x+0.5x=7.5
We move all terms to the left:
x+0.5x-(7.5)=0
We add all the numbers together, and all the variables
1.5x-7.5=0
We move all terms containing x to the left, all other terms to the right
1.5x=7.5
x=7.5/1.5
x=5
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