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y in (-oo:+oo)
5*y-(3*y)-1 = 51/5 // - 51/5
5*y-(3*y)-(51/5)-1 = 0
5*y-3*y-51/5-1 = 0
2*y-56/5 = 0 // + 56/5
2*y = 56/5 // : 2
y = 56/5/2
y = 28/5
y = 28/5
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