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11x-20=15x+8
We move all terms to the left:
11x-20-(15x+8)=0
We get rid of parentheses
11x-15x-8-20=0
We add all the numbers together, and all the variables
-4x-28=0
We move all terms containing x to the left, all other terms to the right
-4x=28
x=28/-4
x=-7
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