15=12+M/7

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Solution for 15=12+M/7 equation: 


M in (-oo:+oo)

15 = M/7+12 // - M/7+12

15-(M/7)-12 = 0

3-1/7*M = 0 // - 3

-1/7*M = -3 // : -1/7

M = -3/(-1/7)

M = 21

M = 21

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