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x in (-oo:+oo)
(-6/7)*x-(1/9) = (4/7)*x+83/63 // - (4/7)*x+83/63
(-6/7)*x-((4/7)*x)-(1/9)-(83/63) = 0
(-6/7)*x+(-4/7)*x-1/9-83/63 = 0
-10/7*x-10/7 = 0 // + 10/7
-10/7*x = 10/7 // : -10/7
x = 10/7/(-10/7)
x = -1
x = -1
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