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x in (-oo:+oo)
(x+6)/4 = (2*x)/5 // - (2*x)/5
(x+6)/4-((2*x)/5) = 0
(x+6)/4+(-2/5)*x = 0
(x+6)/4+(-2*x)/5 = 0
(5*(x+6))/(4*5)+(-2*4*x)/(4*5) = 0
5*(x+6)-2*4*x = 0
30-3*x = 0
(30-3*x)/(4*5) = 0
(30-3*x)/(4*5) = 0 // * 4*5
30-3*x = 0
30-3*x = 0 // - 30
-3*x = -30 // : -3
x = -30/(-3)
x = 10
x = 10
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