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y in (-oo:+oo)
(-21/10)*y = -2/5 // + -2/5
(-21/10)*y-(-2/5) = 0
(-21/10)*y+2/5 = 0
2/5-21/10*y = 0 // - 2/5
-21/10*y = -2/5 // : -21/10
y = -2/5/(-21/10)
y = 4/21
y = 4/21
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