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