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x in (-oo:+oo)
x+8/9 = (-2/7)*x+704/63 // - (-2/7)*x+704/63
x-((-2/7)*x)+8/9-(704/63) = 0
x+(2/7)*x+8/9-704/63 = 0
9/7*x-72/7 = 0 // + 72/7
9/7*x = 72/7 // : 9/7
x = 72/7/9/7
x = 8
x = 8
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