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5x+4(x+9)=144
We move all terms to the left:
5x+4(x+9)-(144)=0
We multiply parentheses
5x+4x+36-144=0
We add all the numbers together, and all the variables
9x-108=0
We move all terms containing x to the left, all other terms to the right
9x=108
x=108/9
x=12
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