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=(2S+3)(2S-7)-(2S-5)(2S+1)+7
We move all terms to the left:
-((2S+3)(2S-7)-(2S-5)(2S+1)+7)=0
We multiply parentheses ..
-((+4S^2-14S+6S-21)-(2S-5)(2S+1)+7)=0
We calculate terms in parentheses: -((+4S^2-14S+6S-21)-(2S-5)(2S+1)+7), so:We add all the numbers together, and all the variables
(+4S^2-14S+6S-21)-(2S-5)(2S+1)+7
We get rid of parentheses
4S^2-14S+6S-(2S-5)(2S+1)-21+7
We multiply parentheses ..
4S^2-(+4S^2+2S-10S-5)-14S+6S-21+7
We add all the numbers together, and all the variables
4S^2-(+4S^2+2S-10S-5)-8S-14
We get rid of parentheses
4S^2-4S^2-2S+10S-8S+5-14
We add all the numbers together, and all the variables
-9
Back to the equation:
-(-9)
9!=0
There is no solution for this equation
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