21/2x_7=13

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Solution for 21/2x_7=13 equation: 


x_7 in (-oo:+oo)

(21/2)*x_7 = 13 // - 13

(21/2)*x_7-13 = 0

21/2*x_7-13 = 0 // + 13

21/2*x_7 = 13 // : 21/2

x_7 = 13/21/2

x_7 = 26/21

x_7 = 26/21

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