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