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x in (-oo:+oo)
(-4/7)*x-(2/9) = -20/63 // + -20/63
(-4/7)*x-(2/9)-(-20/63) = 0
(-4/7)*x-2/9+20/63 = 0
2/21-4/7*x = 0 // - 2/21
-4/7*x = -2/21 // : -4/7
x = -2/21/(-4/7)
x = 1/6
x = 1/6
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