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x in (-oo:+oo)
(5/7)*x-((5/6)*x)-5 = -80/21 // + -80/21
(5/7)*x-((5/6)*x)-(-80/21)-5 = 0
(-5/6)*x+(5/7)*x+80/21-5 = 0
-5/42*x-25/21 = 0 // + 25/21
-5/42*x = 25/21 // : -5/42
x = 25/21/(-5/42)
x = -10
x = -10
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