1/7r+1/3r=10 - solution

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Solution for 1/7r+1/3r=10 equation:

r in (-oo:+oo)

(1/7)*r+(1/3)*r = 10 // - 10

(1/7)*r+(1/3)*r-10 = 0

10/21*r-10 = 0 // + 10

10/21*r = 10 // : 10/21

r = 10/10/21

r = 21

r = 21

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