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x in (-oo:+oo)
(4/5)*x = (2/3)*(x+6) // - (2/3)*(x+6)
(4/5)*x-((2/3)*(x+6)) = 0
(-2/3)*(x+6)+(4/5)*x = 0
(4*x)/5-2/3*(x+6) = 0
(-2/3*5*(x+6))/5+(4*x)/5 = 0
4*x-2/3*5*(x+6) = 0
2/3*x-20 = 0
(2/3*x-20)/5 = 0
(2/3*x-20)/5 = 0 // * 5
2/3*x-20 = 0
2/3*x-20 = 0 // + 20
2/3*x = 20 // : 2/3
x = 20/2/3
x = 30
x = 30
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