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9000=8x+4x
We move all terms to the left:
9000-(8x+4x)=0
We add all the numbers together, and all the variables
-(+12x)+9000=0
We get rid of parentheses
-12x+9000=0
We move all terms containing x to the left, all other terms to the right
-12x=-9000
x=-9000/-12
x=+750
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