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9x-(7x-(8x-(5x-9)))=20
We move all terms to the left:
9x-(7x-(8x-(5x-9)))-(20)=0
We calculate terms in parentheses: -(7x-(8x-(5x-9))), so:We get rid of parentheses
7x-(8x-(5x-9))
We calculate terms in parentheses: -(8x-(5x-9)), so:We get rid of parentheses
8x-(5x-9)
We get rid of parentheses
8x-5x+9
We add all the numbers together, and all the variables
3x+9
Back to the equation:
-(3x+9)
7x-3x-9
We add all the numbers together, and all the variables
4x-9
Back to the equation:
-(4x-9)
9x-4x+9-20=0
We add all the numbers together, and all the variables
5x-11=0
We move all terms containing x to the left, all other terms to the right
5x=11
x=11/5
x=2+1/5
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