(15-3)/4X7=21

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Solution for (15-3)/4X7=21 equation: 


X in (-oo:+oo)

((15-3)/4)*X^7 = 21 // - 21

((15-3)/4)*X^7-21 = 0

3*X^7 = 21 // : 3

X^7 = 7

X^7 = 7 // ^ 1/7

X = 7^(1/7)

X = 7^(1/7)

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