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-3x+3(-5-7x)=9
We move all terms to the left:
-3x+3(-5-7x)-(9)=0
We add all the numbers together, and all the variables
-3x+3(-7x-5)-9=0
We multiply parentheses
-3x-21x-15-9=0
We add all the numbers together, and all the variables
-24x-24=0
We move all terms containing x to the left, all other terms to the right
-24x=24
x=24/-24
x=-1
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