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50+2x=4.5x
We move all terms to the left:
50+2x-(4.5x)=0
We add all the numbers together, and all the variables
2x-(+4.5x)+50=0
We get rid of parentheses
2x-4.5x+50=0
We add all the numbers together, and all the variables
-2.5x+50=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-50
x=-50/-2.5
x=+20
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