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y in (-oo:+oo)
27.3 = (2/4)*y // - (2/4)*y
27.3-((2/4)*y) = 0
(-1/2)*y+27.3 = 0
27.3-1/2*y = 0 // - 27.3
-1/2*y = -27.3 // : -1/2
y = -27.3/(-1/2)
y = 54.6
y = 54.6
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