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3x+2.5=12x-5.5x+3
We move all terms to the left:
3x+2.5-(12x-5.5x+3)=0
We add all the numbers together, and all the variables
3x-(6.5x+3)+2.5=0
We get rid of parentheses
3x-6.5x-3+2.5=0
We add all the numbers together, and all the variables
-3.5x-0.5=0
We move all terms containing x to the left, all other terms to the right
-3.5x=0.5
x=0.5/-3.5
x=-0.5/3.5
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