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m in (-oo:+oo)
-(7*m)-10 = -73 // + 73
73-(7*m)-10 = 0
73-7*m-10 = 0
63-7*m = 0 // - 63
-7*m = -63 // : -7
m = -63/(-7)
m = 9
m = 9
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