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5x+7.5=4
We move all terms to the left:
5x+7.5-(4)=0
We add all the numbers together, and all the variables
5x+3.5=0
We move all terms containing x to the left, all other terms to the right
5x=-3.5
x=-3.5/5
x=-2.33333333333/3.33333333333
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