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m in (-oo:+oo)
(m+2)/3+(m-2)/5 = 4 // - 4
(m+2)/3+(m-2)/5-4 = 0
(5*(m+2))/(3*5)+(3*(m-2))/(3*5)+(-4*3*5)/(3*5) = 0
5*(m+2)+3*(m-2)-4*3*5 = 0
8*m-60+4 = 0
8*m-56 = 0
(8*m-56)/(3*5) = 0
(8*m-56)/(3*5) = 0 // * 3*5
8*m-56 = 0
8*m-56 = 0 // + 56
8*m = 56 // : 8
m = 56/8
m = 7
m = 7
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