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5.50x+7.50=5x+15
We move all terms to the left:
5.50x+7.50-(5x+15)=0
We add all the numbers together, and all the variables
5.50x-(5x+15)+7.5=0
We get rid of parentheses
5.50x-5x-15+7.5=0
We add all the numbers together, and all the variables
0.5x-7.5=0
We move all terms containing x to the left, all other terms to the right
0.5x=7.5
x=7.5/0.5
x=15
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