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11x+13(19-x)=20
We move all terms to the left:
11x+13(19-x)-(20)=0
We add all the numbers together, and all the variables
11x+13(-1x+19)-20=0
We multiply parentheses
11x-13x+247-20=0
We add all the numbers together, and all the variables
-2x+227=0
We move all terms containing x to the left, all other terms to the right
-2x=-227
x=-227/-2
x=113+1/2
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