9/7c-21/2c

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Solution for 9/7c-21/2c equation: 


c in (-oo:+oo)

(9/7)*c-((21/2)*c) = 0

(9/7)*c+(-21/2)*c = 0

-129/14*c = 0 // : -129/14

c = 0

c = 0

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