3-x/7x-21

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Solution for 3-x/7x-21 equation: 


x in (-oo:+oo)

3-((x/7)*x)-21 = 0

(-1/7)*x^2-21+3 = 0

-1/7*x^2 = 18 // : -1/7

x^2 = -126

x belongs to the empty set

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