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12=30x/360
We move all terms to the left:
12-(30x/360)=0
We add all the numbers together, and all the variables
-(+30x/360)+12=0
We get rid of parentheses
-30x/360+12=0
We multiply all the terms by the denominator
-30x+12*360=0
We add all the numbers together, and all the variables
-30x+4320=0
We move all terms containing x to the left, all other terms to the right
-30x=-4320
x=-4320/-30
x=+144
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