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10x+13(1-x)=12
We move all terms to the left:
10x+13(1-x)-(12)=0
We add all the numbers together, and all the variables
10x+13(-1x+1)-12=0
We multiply parentheses
10x-13x+13-12=0
We add all the numbers together, and all the variables
-3x+1=0
We move all terms containing x to the left, all other terms to the right
-3x=-1
x=-1/-3
x=1/3
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