8/2=r/10

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Solution for 8/2=r/10 equation: 


r in (-oo:+oo)

8/2 = r/10 // - r/10

8/2-(r/10) = 0

4-1/10*r = 0 // - 4

-1/10*r = -4 // : -1/10

r = -4/(-1/10)

r = 40

r = 40

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