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11x+9=4x-40
We move all terms to the left:
11x+9-(4x-40)=0
We get rid of parentheses
11x-4x+40+9=0
We add all the numbers together, and all the variables
7x+49=0
We move all terms containing x to the left, all other terms to the right
7x=-49
x=-49/7
x=-7
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