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y in (-oo:+oo)
0.65-((3*y)/4) = 0
(-3/4)*y+0.65 = 0
0.65-3/4*y = 0 // - 0.65
-3/4*y = -0.65 // : -3/4
y = -0.65/(-3/4)
y = 0.86666667
y = 0.86666667
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