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12+9x=11+4x
We move all terms to the left:
12+9x-(11+4x)=0
We add all the numbers together, and all the variables
9x-(4x+11)+12=0
We get rid of parentheses
9x-4x-11+12=0
We add all the numbers together, and all the variables
5x+1=0
We move all terms containing x to the left, all other terms to the right
5x=-1
x=-1/5
x=-1/5
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