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6x+3(6x+15)=-99
We move all terms to the left:
6x+3(6x+15)-(-99)=0
We add all the numbers together, and all the variables
6x+3(6x+15)+99=0
We multiply parentheses
6x+18x+45+99=0
We add all the numbers together, and all the variables
24x+144=0
We move all terms containing x to the left, all other terms to the right
24x=-144
x=-144/24
x=-6
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