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m in (-oo:+oo)
(1.4*m-4.5)/1.5 = 8.2 // - 8.2
(1.4*m-4.5)/1.5-8.2 = 0
(1.4*m-4.5)/1.5+(-8.2*1.5)/1.5 = 0
1.4*m-8.2*1.5-4.5 = 0
1.4*m-16.8 = 0
(1.4*m-16.8)/1.5 = 0
(1.4*m-16.8)/1.5 = 0 // * 1.5
1.4*m-16.8 = 0
1.4*m-16.8 = 0 // + 16.8
1.4*m = 16.8 // : 1.4
m = 16.8/1.4
m = 12
m = 12
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