(-3x/7)=21

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Solution for (-3x/7)=21 equation: 


x in (-oo:+oo)

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

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

-3/7*x-21 = 0 // + 21

-3/7*x = 21 // : -3/7

x = 21/(-3/7)

x = -49

x = -49

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