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y in (-oo:+oo)
42 = (7/2)*y // - (7/2)*y
42-((7/2)*y) = 0
(-7/2)*y+42 = 0
42-7/2*y = 0 // - 42
-7/2*y = -42 // : -7/2
y = -42/(-7/2)
y = 12
y = 12
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