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n in (-oo:+oo)
(-3/5)*(n-30) = (3/5)*n-50 // - (3/5)*n-50
(-3/5)*(n-30)-((3/5)*n)+50 = 0
(-3/5)*(n-30)+(-3/5)*n+50 = 0
(-3*n)/5-3/5*(n-30)+50 = 0
(-3/5*5*(n-30))/5+(-3*n)/5+(5*50)/5 = 0
5*50-3/5*5*(n-30)-3*n = 0
90-6*n+250 = 0
340-6*n = 0
(340-6*n)/5 = 0
(340-6*n)/5 = 0 // * 5
340-6*n = 0
340-6*n = 0 // - 340
-6*n = -340 // : -6
n = -340/(-6)
n = 170/3
n = 170/3
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