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y in (-oo:+oo)
-((7/5)*(y-20))-(1/15) = 0
(-7/5)*(y-20)-1/15 = 0
-7/5*(y-20)-1/15 = 0
(-7/5*15*(y-20))/15-1/15 = 0
-7/5*15*(y-20)-1 = 0
419-21*y = 0
(419-21*y)/15 = 0
(419-21*y)/15 = 0 // * 15
419-21*y = 0
419-21*y = 0 // - 419
-21*y = -419 // : -21
y = -419/(-21)
y = 419/21
y = 419/21
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