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x in (-oo:+oo)
-((5/7)*x)-4/9 = -23/63 // + -23/63
-((5/7)*x)-4/9-(-23/63) = 0
(-5/7)*x-4/9+23/63 = 0
-5/7*x-5/63 = 0 // + 5/63
-5/7*x = 5/63 // : -5/7
x = 5/63/(-5/7)
x = -1/9
x = -1/9
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