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3x-9(-2x-16)=3
We move all terms to the left:
3x-9(-2x-16)-(3)=0
We multiply parentheses
3x+18x+144-3=0
We add all the numbers together, and all the variables
21x+141=0
We move all terms containing x to the left, all other terms to the right
21x=-141
x=-141/21
x=-6+5/7
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