(x/3)+(x/7)=9 - solution

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Solution for (x/3)+(x/7)=9 equation:

x in (-oo:+oo)

x/3+x/7 = 9 // - 9

x/3+x/7-9 = 0

10/21*x-9 = 0 // + 9

10/21*x = 9 // : 10/21

x = 9/10/21

x = 189/10

x = 189/10

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