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12x-98.5=11x-45.5
We move all terms to the left:
12x-98.5-(11x-45.5)=0
We get rid of parentheses
12x-11x+45.5-98.5=0
We add all the numbers together, and all the variables
x-53=0
We move all terms containing x to the left, all other terms to the right
x=53
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