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(9*(y-4))/5 = -2*y // + -2*y
(9*(y-4))/5-(-2*y) = 0
(9*(y-4))/5+2*y = 0
(9*(y-4))/5+(2*5*y)/5 = 0
9*(y-4)+2*5*y = 0
19*y-36 = 0
(19*y-36)/5 = 0
(19*y-36)/5 = 0 // * 5
19*y-36 = 0
19*y-36 = 0 // + 36
19*y = 36 // : 19
y = 36/19
y = 36/19
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