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m in (-oo:+oo)
2*(-2*m-7) = -50 // + 50
2*(-2*m-7)+50 = 0
2*(-2*m-7)+50 = 0
36-4*m = 0
36-4*m = 0
36-4*m = 0 // - 36
-4*m = -36 // : -4
m = -36/(-4)
m = 9
m = 9
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