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5x+3.5=-15
We move all terms to the left:
5x+3.5-(-15)=0
We add all the numbers together, and all the variables
5x+18.5=0
We move all terms containing x to the left, all other terms to the right
5x=-18.5
x=-18.5/5
x=-3+2.3333333333333/3.3333333333333
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