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y in (-oo:+oo)
(-1/4)*y-1 = -13.25 // + 13.25
(-1/4)*y-1+13.25 = 0
12.25-1/4*y = 0 // - 12.25
-1/4*y = -12.25 // : -1/4
y = -12.25/(-1/4)
y = 49
y = 49
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