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f in (-oo:+oo)
(2/3)*(f+4) = 1/3-f // - 1/3-f
(2/3)*(f+4)+f-(1/3) = 0
(2/3)*(f+4)+f-1/3 = 0
2/3*(f+4)+f-1/3 = 0
(2/3*3*(f+4))/3+(3*f)/3-1/3 = 0
2/3*3*(f+4)+3*f-1 = 0
5*f-1+8 = 0
5*f+7 = 0
(5*f+7)/3 = 0
(5*f+7)/3 = 0 // * 3
5*f+7 = 0
5*f+7 = 0 // - 7
5*f = -7 // : 5
f = -7/5
f = -7/5
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