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y in (-oo:+oo)
42 = (6/7)*y // - (6/7)*y
42-((6/7)*y) = 0
(-6/7)*y+42 = 0
42-6/7*y = 0 // - 42
-6/7*y = -42 // : -6/7
y = -42/(-6/7)
y = 49
y = 49
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