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x in (-oo:+oo)
-4/7-(2/7) = (5/3)*x+(4/3)*x // - (5/3)*x+(4/3)*x
-((5/3)*x)-((4/3)*x)-4/7-(2/7) = 0
(-5/3)*x+(-4/3)*x-4/7-2/7 = 0
-3*x-6/7 = 0 // + 6/7
-3*x = 6/7 // : -3
x = 6/7/(-3)
x = -2/7
x = -2/7
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