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7.5x=-12.5
We move all terms to the left:
7.5x-(-12.5)=0
We add all the numbers together, and all the variables
7.5x+12.5=0
We move all terms containing x to the left, all other terms to the right
7.5x=-12.5
x=-12.5/7.5
x=-1+5/7.5
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