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3x-15=2.5x-5
We move all terms to the left:
3x-15-(2.5x-5)=0
We get rid of parentheses
3x-2.5x+5-15=0
We add all the numbers together, and all the variables
0.5x-10=0
We move all terms containing x to the left, all other terms to the right
0.5x=10
x=10/0.5
x=20
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