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x=4x+4x+5x+9
We move all terms to the left:
x-(4x+4x+5x+9)=0
We add all the numbers together, and all the variables
x-(13x+9)=0
We get rid of parentheses
x-13x-9=0
We add all the numbers together, and all the variables
-12x-9=0
We move all terms containing x to the left, all other terms to the right
-12x=9
x=9/-12
x=-3/4
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