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12+3=40-11x
We move all terms to the left:
12+3-(40-11x)=0
We add all the numbers together, and all the variables
-(-11x+40)+12+3=0
We add all the numbers together, and all the variables
-(-11x+40)+15=0
We get rid of parentheses
11x-40+15=0
We add all the numbers together, and all the variables
11x-25=0
We move all terms containing x to the left, all other terms to the right
11x=25
x=25/11
x=2+3/11
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