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x in (-oo:+oo)
x/4-(5/9) = -8/7 // + -8/7
x/4-(5/9)-(-8/7) = 0
x/4-5/9+8/7 = 0
1/4*x+37/63 = 0 // - 37/63
1/4*x = -37/63 // : 1/4
x = -37/63/1/4
x = -148/63
x = -148/63
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