(x/3)-(x/7)=20 - solution

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Solution for (x/3)-(x/7)=20 equation:

x in (-oo:+oo)

x/3-(x/7) = 20 // - 20

x/3-(x/7)-20 = 0

4/21*x-20 = 0 // + 20

4/21*x = 20 // : 4/21

x = 20/4/21

x = 105

x = 105

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