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4(x+9)+5x=0
We add all the numbers together, and all the variables
5x+4(x+9)=0
We multiply parentheses
5x+4x+36=0
We add all the numbers together, and all the variables
9x+36=0
We move all terms containing x to the left, all other terms to the right
9x=-36
x=-36/9
x=-4
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