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y in (-oo:+oo)
-((2/7)*y) = 3/14-(5/14) // - 3/14-(5/14)
5/14-((2/7)*y)-(3/14) = 0
(-2/7)*y-3/14+5/14 = 0
1/7-2/7*y = 0 // - 1/7
-2/7*y = -1/7 // : -2/7
y = -1/7/(-2/7)
y = 1/2
y = 1/2
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