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x in (-oo:+oo)
(3/7)*x-((1/3)*x) = (4/9)*x+1 // - (4/9)*x+1
(3/7)*x-((1/3)*x)-((4/9)*x)-1 = 0
(3/7)*x+(-1/3)*x+(-4/9)*x-1 = 0
-22/63*x-1 = 0 // + 1
-22/63*x = 1 // : -22/63
x = 1/(-22/63)
x = -63/22
x = -63/22
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