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m in (-oo:+oo)
10-7*m = 4*m-100 // - 4*m-100
10-7*m-(4*m)+100 = 0
10-7*m-4*m+100 = 0
110-11*m = 0 // - 110
-11*m = -110 // : -11
m = -110/(-11)
m = 10
m = 10
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