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20x+8(1-x)=12
We move all terms to the left:
20x+8(1-x)-(12)=0
We add all the numbers together, and all the variables
20x+8(-1x+1)-12=0
We multiply parentheses
20x-8x+8-12=0
We add all the numbers together, and all the variables
12x-4=0
We move all terms containing x to the left, all other terms to the right
12x=4
x=4/12
x=1/3
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