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165+3x=12+3.50x
We move all terms to the left:
165+3x-(12+3.50x)=0
We add all the numbers together, and all the variables
3x-(3.50x+12)+165=0
We get rid of parentheses
3x-3.50x-12+165=0
We add all the numbers together, and all the variables
-0.5x+153=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-153
x=-153/-0.5
x=+306
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