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X in (-oo:+oo)
(4*(X+2/3))/(-5) = 4/105 // - 4/105
(4*(X+2/3))/(-5)-(4/105) = 0
(4*(X+2/3))/(-5)-4/105 = 0
(4*105*(X+2/3))/(-5*105)+(-5*(-4))/(-5*105) = 0
4*105*(X+2/3)-5*(-4) = 0
420*X+300 = 0
(420*X+300)/(-5*105) = 0
(420*X+300)/(-5*105) = 0 // * -5*105
420*X+300 = 0
420*X+300 = 0 // - 300
420*X = -300 // : 420
X = -300/420
X = -5/7
X = -5/7
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