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15=2.5x+5
We move all terms to the left:
15-(2.5x+5)=0
We get rid of parentheses
-2.5x-5+15=0
We add all the numbers together, and all the variables
-2.5x+10=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-10
x=-10/-2.5
x=+4
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