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f in (-oo:+oo)
(1/3)*(6*f-12)+f = 4*(1/2)*f-2 // - 4*(1/2)*f-2
(1/3)*(6*f-12)+f-(4*(1/2)*f)+2 = 0
(1/3)*(6*f-12)+f-2*f+2 = 0
1/3*(6*f-12)+f-2*f+2 = 0
1/3*(6*f-12)+f-2*f+2 = 0
3*f-2*f-4+2 = 0
f-4+2 = 0
f-2 = 0
f-2 = 0
f-2 = 0 // + 2
f = 2
f = 2
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