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x in (-oo:+oo)
((5*6)/6)*x-(((3*7)/5)*x) = (2/15)*(5-((3/4)*x)) // - (2/15)*(5-((3/4)*x))
((5*6)/6)*x-((2/15)*(5-((3/4)*x)))-(((3*7)/5)*x) = 0
(-2/15)*((-3/4)*x+5)+((5*6)/6)*x+(-21/5)*x = 0
5*x-2/15*(5-3/4*x)+(-21*x)/5 = 0
(-2/15*5*(5-3/4*x))/5+(5*5*x)/5+(-21*x)/5 = 0
5*5*x-2/15*5*(5-3/4*x)-21*x = 0
51/2*x-21*x-10/3 = 0
9/2*x-10/3 = 0
(9/2*x-10/3)/5 = 0
(9/2*x-10/3)/5 = 0 // * 5
9/2*x-10/3 = 0
9/2*x-10/3 = 0 // + 10/3
9/2*x = 10/3 // : 9/2
x = 10/3/9/2
x = 20/27
x = 20/27
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