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x in (-oo:+oo)
(1/5)*x-2/3 = (6/7)*x+758/105 // - (6/7)*x+758/105
(1/5)*x-((6/7)*x)-2/3-(758/105) = 0
(1/5)*x+(-6/7)*x-2/3-758/105 = 0
-23/35*x-276/35 = 0 // + 276/35
-23/35*x = 276/35 // : -23/35
x = 276/35/(-23/35)
x = -12
x = -12
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