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y in (-oo:+oo)
(7*y)/3+11 = (9*y)/4+15 // - (9*y)/4+15
(7*y)/3-((9*y)/4)-15+11 = 0
(7*y)/3+(-9/4)*y-15+11 = 0
1/12*y-4 = 0 // + 4
1/12*y = 4 // : 1/12
y = 4/1/12
y = 48
y = 48
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