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