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f in (-oo:+oo)
2*((9/10)*f-(1/3)) = 0
2*((9/10)*f-1/3) = 0
2*(9/10*f-1/3) = 0
9/10*f-1/3 = 0 // + 1/3
9/10*f = 1/3 // : 9/10
f = 1/3/9/10
f = 10/27
f = 10/27
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