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12000=3000+25x
We move all terms to the left:
12000-(3000+25x)=0
We add all the numbers together, and all the variables
-(25x+3000)+12000=0
We get rid of parentheses
-25x-3000+12000=0
We add all the numbers together, and all the variables
-25x+9000=0
We move all terms containing x to the left, all other terms to the right
-25x=-9000
x=-9000/-25
x=+360
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