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10x+20=(21x+1)=(7x+17)
We move all terms to the left:
10x+20-((21x+1))=0
We calculate terms in parentheses: -((21x+1)), so:We get rid of parentheses
(21x+1)
We get rid of parentheses
21x+1
Back to the equation:
-(21x+1)
10x-21x-1+20=0
We add all the numbers together, and all the variables
-11x+19=0
We move all terms containing x to the left, all other terms to the right
-11x=-19
x=-19/-11
x=1+8/11
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