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18=400x*9/12
We move all terms to the left:
18-(400x*9/12)=0
We add all the numbers together, and all the variables
-(+400x*9/12)+18=0
We get rid of parentheses
-400x*9/12+18=0
We multiply all the terms by the denominator
-400x*9+18*12=0
We add all the numbers together, and all the variables
-400x*9+216=0
Wy multiply elements
-3600x+216=0
We move all terms containing x to the left, all other terms to the right
-3600x=-216
x=-216/-3600
x=3/50
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