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12=85x+81/28
We move all terms to the left:
12-(85x+81/28)=0
We add all the numbers together, and all the variables
-(+85x+81/28)+12=0
We get rid of parentheses
-85x+12-81/28=0
We multiply all the terms by the denominator
-85x*28-81+12*28=0
We add all the numbers together, and all the variables
-85x*28+255=0
Wy multiply elements
-2380x+255=0
We move all terms containing x to the left, all other terms to the right
-2380x=-255
x=-255/-2380
x=3/28
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