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m in (-oo:+oo)
(2/7)*(4*m-19) = 12 // - 12
(2/7)*(4*m-19)-12 = 0
2/7*(4*m-19)-12 = 0
2/7*(4*m-19)-12 = 0
8/7*m-122/7 = 0
8/7*m-122/7 = 0
8/7*m-122/7 = 0 // + 122/7
8/7*m = 122/7 // : 8/7
m = 122/7/8/7
m = 61/4
m = 61/4
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