4-r/5=2

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Solution for 4-r/5=2 equation: 


r in (-oo:+oo)

4-(r/5) = 2 // - 2

4-(r/5)-2 = 0

2-1/5*r = 0 // - 2

-1/5*r = -2 // : -1/5

r = -2/(-1/5)

r = 10

r = 10

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