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2x+2.5=-15
We move all terms to the left:
2x+2.5-(-15)=0
We add all the numbers together, and all the variables
2x+17.5=0
We move all terms containing x to the left, all other terms to the right
2x=-17.5
x=-17.5/2
x=-8+1/1.3333333333333
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