(7-x)/18=x/3

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Solution for (7-x)/18=x/3 equation: 


x in (-oo:+oo)

(7-x)/18 = x/3 // - x/3

(7-x)/18-(x/3) = 0

(7-x)/18-x/3 = 0

(3*(7-x))/(3*18)+(18*(-x))/(3*18) = 0

3*(7-x)+18*(-x) = 0

21-21*x = 0

(21-21*x)/(3*18) = 0

(21-21*x)/(3*18) = 0 // * 3*18

21-21*x = 0

21-21*x = 0 // - 21

-21*x = -21 // : -21

x = -21/(-21)

x = 1

x = 1

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