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-12(5x+300)=300
We move all terms to the left:
-12(5x+300)-(300)=0
We multiply parentheses
-60x-3600-300=0
We add all the numbers together, and all the variables
-60x-3900=0
We move all terms containing x to the left, all other terms to the right
-60x=3900
x=3900/-60
x=-65
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