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x in (-oo:+oo)
(2/3)*(6*x+30) = 5*(x+4)+x-(2*x) // - 5*(x+4)+x-(2*x)
(2/3)*(6*x+30)-(5*(x+4))-x+2*x = 0
(2/3)*(6*x+30)-5*(x+4)-x+2*x = 0
2/3*(6*x+30)-5*(x+4)-x+2*x = 0
2/3*(6*x+30)-5*(x+4)-x+2*x = 0
2*x-x-x = 0
2*x-2*x = 0
0 = 0
0 = 0
x belongs to the empty set
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