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6(2x+9)=150
We move all terms to the left:
6(2x+9)-(150)=0
We multiply parentheses
12x+54-150=0
We add all the numbers together, and all the variables
12x-96=0
We move all terms containing x to the left, all other terms to the right
12x=96
x=96/12
x=8
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