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-3(x+6)=30
We move all terms to the left:
-3(x+6)-(30)=0
We multiply parentheses
-3x-18-30=0
We add all the numbers together, and all the variables
-3x-48=0
We move all terms containing x to the left, all other terms to the right
-3x=48
x=48/-3
x=-16
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