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m in (-oo:+oo)
(-7/2)*(m-2) = 21 // - 21
(-7/2)*(m-2)-21 = 0
-7/2*(m-2)-21 = 0
-7/2*(m-2)-21 = 0
-7/2*m-14 = 0
-7/2*m-14 = 0
-7/2*m-14 = 0 // + 14
-7/2*m = 14 // : -7/2
m = 14/(-7/2)
m = -4
m = -4
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