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11+4x=9x-4
We move all terms to the left:
11+4x-(9x-4)=0
We get rid of parentheses
4x-9x+4+11=0
We add all the numbers together, and all the variables
-5x+15=0
We move all terms containing x to the left, all other terms to the right
-5x=-15
x=-15/-5
x=+3
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