20=u/3-15

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Solution for 20=u/3-15 equation: 


u in (-oo:+oo)

20 = u/3-15 // - u/3-15

15-(u/3)+20 = 0

35-1/3*u = 0 // - 35

-1/3*u = -35 // : -1/3

u = -35/(-1/3)

u = 105

u = 105

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