(M/-4)-13=7

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Solution for (M/-4)-13=7 equation: 


M in (-oo:+oo)

M/(-4)-13 = 7 // - 7

M/(-4)-13-7 = 0

-1/4*M-20 = 0 // + 20

-1/4*M = 20 // : -1/4

M = 20/(-1/4)

M = -80

M = -80

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