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y in (-oo:+oo)
5*y+5*y+6/4+2/2 = 25 // - 25
5*y+5*y+6/4+2/2-25 = 0
10*y-45/2 = 0 // + 45/2
10*y = 45/2 // : 10
y = 45/2/10
y = 9/4
y = 9/4
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