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2.5x+20=4.5x-4
We move all terms to the left:
2.5x+20-(4.5x-4)=0
We get rid of parentheses
2.5x-4.5x+4+20=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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