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y in (-oo:+oo)
(4/5)*y = 5*y-168 // - 5*y-168
(4/5)*y-(5*y)+168 = 0
(4/5)*y-5*y+168 = 0
168-21/5*y = 0 // - 168
-21/5*y = -168 // : -21/5
y = -168/(-21/5)
y = 40
y = 40
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