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y in (-oo:+oo)
(1/3)*(5*y-2)+(1/9)*(12*y+10) = 0
1/3*(5*y-2)+1/9*(12*y+10) = 0
1/3*(5*y-2)+1/9*(12*y+10) = 0
3*y+4/9 = 0
3*y+4/9 = 0
3*y+4/9 = 0 // - 4/9
3*y = -4/9 // : 3
y = -4/9/3
y = -4/27
y = -4/27
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