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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-14 = 0 // + 14
1/2*y = 14 // : 1/2
y = 14/1/2
y = 28
y = 28
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