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-3(1+7x)-x=12-7x
We move all terms to the left:
-3(1+7x)-x-(12-7x)=0
We add all the numbers together, and all the variables
-3(7x+1)-x-(-7x+12)=0
We add all the numbers together, and all the variables
-1x-3(7x+1)-(-7x+12)=0
We multiply parentheses
-1x-21x-(-7x+12)-3=0
We get rid of parentheses
-1x-21x+7x-12-3=0
We add all the numbers together, and all the variables
-15x-15=0
We move all terms containing x to the left, all other terms to the right
-15x=15
x=15/-15
x=-1
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