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y in (-oo:+oo)
-6*y = 3/7 // - 3/7
-6*y-(3/7) = 0
-6*y-3/7 = 0
-6*y-3/7 = 0 // + 3/7
-6*y = 3/7 // : -6
y = 3/7/(-6)
y = -1/14
y = -1/14
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