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(4*y-9)/5 = (14-9)/20 // - (14-9)/20
(4*y-9)/5-((14-9)/20) = 0
(4*y-9)/5-1/4 = 0
(4*(4*y-9))/(4*5)+(-1*5)/(4*5) = 0
4*(4*y-9)-1*5 = 0
16*y-41 = 0
(16*y-41)/(4*5) = 0
(16*y-41)/(4*5) = 0 // * 4*5
16*y-41 = 0
16*y-41 = 0 // + 41
16*y = 41 // : 16
y = 41/16
y = 41/16
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