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y in (-oo:+oo)
3/4-((1/2)*y)-5 = 7 // - 7
3/4-((1/2)*y)-7-5 = 0
(-1/2)*y+3/4-7-5 = 0
-1/2*y-45/4 = 0 // + 45/4
-1/2*y = 45/4 // : -1/2
y = 45/4/(-1/2)
y = -45/2
y = -45/2
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