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y in (-oo:+oo)
25 = (5/9)*y // - (5/9)*y
25-((5/9)*y) = 0
(-5/9)*y+25 = 0
25-5/9*y = 0 // - 25
-5/9*y = -25 // : -5/9
y = -25/(-5/9)
y = 45
y = 45
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