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3x+2.5=12x-2.5x+3
We move all terms to the left:
3x+2.5-(12x-2.5x+3)=0
We add all the numbers together, and all the variables
3x-(9.5x+3)+2.5=0
We get rid of parentheses
3x-9.5x-3+2.5=0
We add all the numbers together, and all the variables
-6.5x-0.5=0
We move all terms containing x to the left, all other terms to the right
-6.5x=0.5
x=0.5/-6.5
x=-0.5/6.5
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