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x in (-oo:+oo)
-((5/7)*x)-4/9 = -131/126 // + -131/126
-((5/7)*x)-4/9-(-131/126) = 0
(-5/7)*x-4/9+131/126 = 0
25/42-5/7*x = 0 // - 25/42
-5/7*x = -25/42 // : -5/7
x = -25/42/(-5/7)
x = 5/6
x = 5/6
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