x+4x/3=21 - solution

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Solution for x+4x/3=21 equation:

x in (-oo:+oo)

x+(4*x)/3 = 21 // - 21

x+(4*x)/3-21 = 0

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

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

x = 21/7/3

x = 9

x = 9

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