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y in (-oo:+oo)
-47 = -y/2 // + -y/2
-(-y/2)-47 = 0
(1/2)*y-47 = 0
1/2*y-47 = 0 // + 47
1/2*y = 47 // : 1/2
y = 47/1/2
y = 94
y = 94
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