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y in (-oo:+oo)
21/5-y+9/10 = -13/2 // + -13/2
21/5-y+9/10-(-13/2) = 0
21/5-y+9/10+13/2 = 0
58/5-y = 0 // - 58/5
-y = -58/5 // * -1
y = 58/5
y = 58/5
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