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4.5x+39=2x+89
We move all terms to the left:
4.5x+39-(2x+89)=0
We get rid of parentheses
4.5x-2x-89+39=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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