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y in (-oo:+oo)
42 = (7/3)*y // - (7/3)*y
42-((7/3)*y) = 0
(-7/3)*y+42 = 0
42-7/3*y = 0 // - 42
-7/3*y = -42 // : -7/3
y = -42/(-7/3)
y = 18
y = 18
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