4r/5-r/10=7 - solution

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Solution for 4r/5-r/10=7 equation:

r in (-oo:+oo)

(4*r)/5-(r/10) = 7 // - 7

(4*r)/5-(r/10)-7 = 0

7/10*r-7 = 0 // + 7

7/10*r = 7 // : 7/10

r = 7/7/10

r = 10

r = 10

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