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y in (-oo:+oo)
y/2+4 = (3*y)/4-3 // - (3*y)/4-3
y/2-((3*y)/4)+3+4 = 0
y/2+(-3/4)*y+3+4 = 0
7-1/4*y = 0 // - 7
-1/4*y = -7 // : -1/4
y = -7/(-1/4)
y = 28
y = 28
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