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y in (-oo:+oo)
42 = (6/5)*y // - (6/5)*y
42-((6/5)*y) = 0
(-6/5)*y+42 = 0
42-6/5*y = 0 // - 42
-6/5*y = -42 // : -6/5
y = -42/(-6/5)
y = 35
y = 35
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