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y in (-oo:+oo)
(2*y-6)/4 = 12*50+5 // - 12*50+5
(2*y-6)/4-(12*50)-5 = 0
(2*y-6)/4-600-5 = 0
(2*y-6)/4+(-600*4)/4+(-5*4)/4 = 0
2*y-600*4-5*4-6 = 0
2*y-2406-20 = 0
2*y-2426 = 0
(2*y-2426)/4 = 0
(2*y-2426)/4 = 0 // * 4
2*y-2426 = 0
2*y-2426 = 0 // + 2426
2*y = 2426 // : 2
y = 2426/2
y = 1213
y = 1213
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