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y in (-oo:+oo)
-5*y = -2/7 // + -2/7
-5*y-(-2/7) = 0
2/7-5*y = 0
2/7-5*y = 0 // - 2/7
-5*y = -2/7 // : -5
y = -2/7/(-5)
y = 2/35
y = 2/35
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