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y in (-oo:+oo)
(3/4)*y+6*y+8 = 7*y-4 // - 7*y-4
(3/4)*y+6*y-(7*y)+4+8 = 0
(3/4)*y+6*y-7*y+4+8 = 0
12-1/4*y = 0 // - 12
-1/4*y = -12 // : -1/4
y = -12/(-1/4)
y = 48
y = 48
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