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y in (-oo:+oo)
(1/2)*y-(21/4) = -35/4 // + -35/4
(1/2)*y-(21/4)-(-35/4) = 0
(1/2)*y-21/4+35/4 = 0
1/2*y+7/2 = 0 // - 7/2
1/2*y = -7/2 // : 1/2
y = -7/2/1/2
y = -7
y = -7
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