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12x-3.5=13x-6.25
We move all terms to the left:
12x-3.5-(13x-6.25)=0
We get rid of parentheses
12x-13x+6.25-3.5=0
We add all the numbers together, and all the variables
-1x+2.75=0
We move all terms containing x to the left, all other terms to the right
-x=-2.75
x=-2.75/-1
x=2+0.75/1
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