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m in (-oo:+oo)
10-7*m = 4*m+131 // - 4*m+131
10-7*m-(4*m)-131 = 0
10-7*m-4*m-131 = 0
-11*m-121 = 0 // + 121
-11*m = 121 // : -11
m = 121/(-11)
m = -11
m = -11
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