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y in (-oo:+oo)
(1/1)*y+(3/4)*y+1 = -15 // + 15
(1/1)*y+(3/4)*y+1+15 = 0
y+(3/4)*y+1+15 = 0
7/4*y+16 = 0 // - 16
7/4*y = -16 // : 7/4
y = -16/7/4
y = -64/7
y = -64/7
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