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