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m in (-oo:+oo)
(11/5)*m-2*m-(1/8)+7 = -281/40 // + -281/40
(11/5)*m-2*m-(1/8)-(-281/40)+7 = 0
(11/5)*m-2*m-1/8+281/40+7 = 0
1/5*m+139/10 = 0 // - 139/10
1/5*m = -139/10 // : 1/5
m = -139/10/1/5
m = -139/2
m = -139/2
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