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y in (-oo:+oo)
-3.1 = y/7 // - y/7
-(y/7)-3.1 = 0
-1/7*y-3.1 = 0 // + 3.1
-1/7*y = 3.1 // : -1/7
y = 3.1/(-1/7)
y = -21.70000043
y = -21.70000043
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