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y in (-oo:+oo)
y/2 = 3/10+4 // - 3/10+4
y/2-(3/10)-4 = 0
y/2-3/10-4 = 0
1/2*y-43/10 = 0 // + 43/10
1/2*y = 43/10 // : 1/2
y = 43/10/1/2
y = 43/5
y = 43/5
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