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3x+6(-5x-11)=123
We move all terms to the left:
3x+6(-5x-11)-(123)=0
We multiply parentheses
3x-30x-66-123=0
We add all the numbers together, and all the variables
-27x-189=0
We move all terms containing x to the left, all other terms to the right
-27x=189
x=189/-27
x=-7
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