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x in (-oo:+oo)
(8*x-(4*f))/3 = a // - a
(8*x-(4*f))/3-a = 0
(8*x-4*f)/3-a = 0
(8*x-4*f)/3+(3*(-a))/3 = 0
3*(-a)-4*f+8*x = 0
8*x-3*a-4*f = 0
(8*x-3*a-4*f)/3 = 0
(8*x-3*a-4*f)/3 = 0 // * 3
8*x-3*a-4*f = 0
8*x-3*a-4*f = 0 // + -3*a-4*f
8*x = -(-3*a-4*f) // : 8
x = (-(-3*a-4*f))/8
x = (-(-3*a-4*f))/8
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