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0.5x+15=3x+20
We move all terms to the left:
0.5x+15-(3x+20)=0
We get rid of parentheses
0.5x-3x-20+15=0
We add all the numbers together, and all the variables
-2.5x-5=0
We move all terms containing x to the left, all other terms to the right
-2.5x=5
x=5/-2.5
x=-2
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