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m in (-oo:+oo)
(4/9)*m-((1/3)*m)+13 = 4 // - 4
(4/9)*m-((1/3)*m)-4+13 = 0
(4/9)*m+(-1/3)*m-4+13 = 0
1/9*m+9 = 0 // - 9
1/9*m = -9 // : 1/9
m = -9/1/9
m = -81
m = -81
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