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-29=-(1+3x)-(7+4x)
We move all terms to the left:
-29-(-(1+3x)-(7+4x))=0
We add all the numbers together, and all the variables
-(-(3x+1)-(4x+7))-29=0
We calculate terms in parentheses: -(-(3x+1)-(4x+7)), so:We get rid of parentheses
-(3x+1)-(4x+7)
We get rid of parentheses
-3x-4x-1-7
We add all the numbers together, and all the variables
-7x-8
Back to the equation:
-(-7x-8)
7x+8-29=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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