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9(x+13)-5(21-2x)-4x=9x
We move all terms to the left:
9(x+13)-5(21-2x)-4x-(9x)=0
We add all the numbers together, and all the variables
9(x+13)-5(-2x+21)-4x-9x=0
We add all the numbers together, and all the variables
-13x+9(x+13)-5(-2x+21)=0
We multiply parentheses
-13x+9x+10x+117-105=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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