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(42+x)/3=12+x
We move all terms to the left:
(42+x)/3-(12+x)=0
We add all the numbers together, and all the variables
(x+42)/3-(x+12)=0
We get rid of parentheses
(x+42)/3-x-12=0
We multiply all the terms by the denominator
(x+42)-x*3-12*3=0
We add all the numbers together, and all the variables
(x+42)-x*3-36=0
Wy multiply elements
(x+42)-3x-36=0
We get rid of parentheses
x-3x+42-36=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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