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x in (-oo:+oo)
-38/63 = x+(1/3)*x+2/7 // - x+(1/3)*x+2/7
-x-((1/3)*x)-38/63-(2/7) = 0
(-1/3)*x-x-38/63-2/7 = 0
-4/3*x-8/9 = 0 // + 8/9
-4/3*x = 8/9 // : -4/3
x = 8/9/(-4/3)
x = -2/3
x = -2/3
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