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y in (-oo:+oo)
3/4-((1/2)*(4*y+7))-y = 0
(-1/2)*(4*y+7)-y+3/4 = 0
3/4-1/2*(4*y+7)-y = 0
(-1/2*4*(4*y+7))/4+(4*(-y))/4+3/4 = 0
4*(-y)-1/2*4*(4*y+7)+3 = 0
3-12*y-14 = 0
-12*y-11 = 0
(-12*y-11)/4 = 0
(-12*y-11)/4 = 0 // * 4
-12*y-11 = 0
-12*y-11 = 0 // + 11
-12*y = 11 // : -12
y = 11/(-12)
y = -11/12
y = -11/12
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