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y in (-oo:+oo)
(3/4)*y-4 = (1/2)*y+7 // - (1/2)*y+7
(3/4)*y-((1/2)*y)-7-4 = 0
(3/4)*y+(-1/2)*y-7-4 = 0
1/4*y-11 = 0 // + 11
1/4*y = 11 // : 1/4
y = 11/1/4
y = 44
y = 44
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