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n in (-oo:+oo)
(21/4)*n-(4.2*((5/7)*n-(0.5*n)))-((2/7)*n)+4/9 = 0
(-2/7)*n-4.2*((5/7)*n-0.5*n)+(21/4)*n+4/9 = 0
(-2*n)/7-4.2*0.21428571*n+(21*n)/4+4/9 = 0
(-4.2*0.21428571*4*7*9*n)/(4*7*9)+(-2*4*9*n)/(4*7*9)+(7*9*21*n)/(4*7*9)+(7*4^2)/(4*7*9) = 0
7*9*21*n-4.2*0.21428571*4*7*9*n-2*4*9*n+7*4^2 = 0
1323*n-298.799995464*n+112 = 0
1024.200004536*n+112 = 0
(1024.200004536*n+112)/(4*7*9) = 0
(1024.200004536*n+112)/(4*7*9) = 0 // * 4*7*9
1024.200004536*n+112 = 0
1024.200004536*n+112 = 0 // - 112
1024.200004536*n = -112 // : 1024.200004536
n = -112/1024.200004536
n = -0.10935364
n = -0.10935364
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