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11x+7=3x+9
We move all terms to the left:
11x+7-(3x+9)=0
We get rid of parentheses
11x-3x-9+7=0
We add all the numbers together, and all the variables
8x-2=0
We move all terms containing x to the left, all other terms to the right
8x=2
x=2/8
x=1/4
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