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-3(4x+3)=75
We move all terms to the left:
-3(4x+3)-(75)=0
We multiply parentheses
-12x-9-75=0
We add all the numbers together, and all the variables
-12x-84=0
We move all terms containing x to the left, all other terms to the right
-12x=84
x=84/-12
x=-7
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