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y in (-oo:+oo)
((1/5)*y+6)*((1/5)*y-7) = 0
(1/5*y+6)*(1/5*y-7) = 0
( 1/5*y+6 )
1/5*y+6 = 0 // - 6
1/5*y = -6 // : 1/5
y = -6/1/5
y = -30
( 1/5*y-7 )
1/5*y-7 = 0 // + 7
1/5*y = 7 // : 1/5
y = 7/1/5
y = 35
y in { -30, 35 }
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