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m in (-oo:+oo)
17 = 7*m-3*m-3 // - 7*m-3*m-3
3-(-3*m)-(7*m)+17 = 0
3*m-7*m+3+17 = 0
20-4*m = 0 // - 20
-4*m = -20 // : -4
m = -20/(-4)
m = 5
m = 5
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