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y in (-oo:+oo)
4*y-1 = (2/3)*(y-5) // - (2/3)*(y-5)
4*y-((2/3)*(y-5))-1 = 0
(-2/3)*(y-5)+4*y-1 = 0
4*y-2/3*(y-5)-1 = 0
4*y-2/3*(y-5)-1 = 0
10/3*y-1+10/3 = 0
10/3*y+7/3 = 0
10/3*y+7/3 = 0
10/3*y+7/3 = 0 // - 7/3
10/3*y = -7/3 // : 10/3
y = -7/3/10/3
y = -7/10
y = -7/10
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