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x in (-oo:+oo)
(-4/5)*x+2/3 = (-4/7)*x+422/525 // - (-4/7)*x+422/525
(-4/5)*x-((-4/7)*x)+2/3-(422/525) = 0
(-4/5)*x+(4/7)*x+2/3-422/525 = 0
-8/35*x-24/175 = 0 // + 24/175
-8/35*x = 24/175 // : -8/35
x = 24/175/(-8/35)
x = -3/5
x = -3/5
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