4/7=4x/21

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Solution for 4/7=4x/21 equation: 


x in (-oo:+oo)

4/7 = (4*x)/21 // - (4*x)/21

4/7-((4*x)/21) = 0

(-4/21)*x+4/7 = 0

4/7-4/21*x = 0 // - 4/7

-4/21*x = -4/7 // : -4/21

x = -4/7/(-4/21)

x = 3

x = 3

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