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y in (-oo:+oo)
(1/3)*y+(1/4)*y = 7/2 // - 7/2
(1/3)*y+(1/4)*y-(7/2) = 0
(1/3)*y+(1/4)*y-7/2 = 0
7/12*y-7/2 = 0 // + 7/2
7/12*y = 7/2 // : 7/12
y = 7/2/7/12
y = 6
y = 6
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