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-2.5-3.5x=1.5x+15
We move all terms to the left:
-2.5-3.5x-(1.5x+15)=0
We get rid of parentheses
-3.5x-1.5x-15-2.5=0
We add all the numbers together, and all the variables
-5x-17.5=0
We move all terms containing x to the left, all other terms to the right
-5x=17.5
x=17.5/-5
x=-3+2.5/5
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