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-3(3x+10)=-21
We move all terms to the left:
-3(3x+10)-(-21)=0
We add all the numbers together, and all the variables
-3(3x+10)+21=0
We multiply parentheses
-9x-30+21=0
We add all the numbers together, and all the variables
-9x-9=0
We move all terms containing x to the left, all other terms to the right
-9x=9
x=9/-9
x=-1
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