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y in (-oo:+oo)
y-(2*y)+3*y+2/7 = 4*y-(3/3)-3 // - 4*y-(3/3)-3
y-(2*y)+3*y-(4*y)+2/7+3/3+3 = 0
y-2*y+3*y-4*y+2/7+3/3+3 = 0
30/7-2*y = 0 // - 30/7
-2*y = -30/7 // : -2
y = -30/7/(-2)
y = 15/7
y = 15/7
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