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x in (-oo:+oo)
-((1/2)*x)-5/9 = (3/7)*x-(421/126) // - (3/7)*x-(421/126)
421/126-((1/2)*x)-((3/7)*x)-5/9 = 0
(-1/2)*x+(-3/7)*x-5/9+421/126 = 0
39/14-13/14*x = 0 // - 39/14
-13/14*x = -39/14 // : -13/14
x = -39/14/(-13/14)
x = 3
x = 3
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