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y in (-oo:+oo)
-y-1 = (3/4)*y-15 // - (3/4)*y-15
15-y-((3/4)*y)-1 = 0
(-3/4)*y-y-1+15 = 0
14-7/4*y = 0 // - 14
-7/4*y = -14 // : -7/4
y = -14/(-7/4)
y = 8
y = 8
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