10-r/2=8

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Solution for 10-r/2=8 equation: 


r in (-oo:+oo)

10-(r/2) = 8 // - 8

10-(r/2)-8 = 0

2-1/2*r = 0 // - 2

-1/2*r = -2 // : -1/2

r = -2/(-1/2)

r = 4

r = 4

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