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