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(9*(y-5))/4 = -3*y // + -3*y
(9*(y-5))/4-(-3*y) = 0
(9*(y-5))/4+3*y = 0
(9*(y-5))/4+(3*4*y)/4 = 0
9*(y-5)+3*4*y = 0
21*y-45 = 0
(21*y-45)/4 = 0
(21*y-45)/4 = 0 // * 4
21*y-45 = 0
21*y-45 = 0 // + 45
21*y = 45 // : 21
y = 45/21
y = 15/7
y = 15/7
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