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12(3-x)=45
We move all terms to the left:
12(3-x)-(45)=0
We add all the numbers together, and all the variables
12(-1x+3)-45=0
We multiply parentheses
-12x+36-45=0
We add all the numbers together, and all the variables
-12x-9=0
We move all terms containing x to the left, all other terms to the right
-12x=9
x=9/-12
x=-3/4
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