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x in (-oo:+oo)
(4/5)*x-((1/4)*x)-6 = (7/10)*x // - (7/10)*x
(4/5)*x-((1/4)*x)-((7/10)*x)-6 = 0
(4/5)*x+(-1/4)*x+(-7/10)*x-6 = 0
-3/20*x-6 = 0 // + 6
-3/20*x = 6 // : -3/20
x = 6/(-3/20)
x = -40
x = -40
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