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y in (-oo:+oo)
8*y-((1/8)*(40*y-48)) = 0
(-1/8)*(40*y-48)+8*y = 0
8*y-1/8*(40*y-48) = 0
8*y-1/8*(40*y-48) = 0
3*y+6 = 0
3*y+6 = 0
3*y+6 = 0 // - 6
3*y = -6 // : 3
y = -6/3
y = -2
y = -2
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