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12+x=40-5x/2
We move all terms to the left:
12+x-(40-5x/2)=0
We add all the numbers together, and all the variables
x-(-5x/2+40)+12=0
We get rid of parentheses
x+5x/2-40+12=0
We multiply all the terms by the denominator
x*2+5x-40*2+12*2=0
We add all the numbers together, and all the variables
5x+x*2-56=0
Wy multiply elements
5x+2x-56=0
We add all the numbers together, and all the variables
7x-56=0
We move all terms containing x to the left, all other terms to the right
7x=56
x=56/7
x=8
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