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2.5-7.5x=3.5x-20
We move all terms to the left:
2.5-7.5x-(3.5x-20)=0
We get rid of parentheses
-7.5x-3.5x+20+2.5=0
We add all the numbers together, and all the variables
-11x+22.5=0
We move all terms containing x to the left, all other terms to the right
-11x=-22.5
x=-22.5/-11
x=2+0.5/11
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