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-(1+7x)-(-12-3x)=36-3x-30
We move all terms to the left:
-(1+7x)-(-12-3x)-(36-3x-30)=0
We add all the numbers together, and all the variables
-(7x+1)-(-3x-12)-(-3x+6)=0
We get rid of parentheses
-7x+3x+3x-1+12-6=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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