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y in (-oo:+oo)
(3*y)/4-7 = 5/4 // - 5/4
(3*y)/4-(5/4)-7 = 0
(3*y)/4-5/4-7 = 0
3/4*y-33/4 = 0 // + 33/4
3/4*y = 33/4 // : 3/4
y = 33/4/3/4
y = 11
y = 11
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