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x in (-oo:+oo)
(5/4)*x-((4/3)*x) = (5/6)*((1/5)*x+3) // - (5/6)*((1/5)*x+3)
(5/4)*x-((5/6)*((1/5)*x+3))-((4/3)*x) = 0
(-5/6)*((1/5)*x+3)+(5/4)*x+(-4/3)*x = 0
(5*x)/4-5/6*(1/5*x+3)+(-4*x)/3 = 0
(-5/6*3*4*(1/5*x+3))/(3*4)+(3*5*x)/(3*4)+(-4*4*x)/(3*4) = 0
3*5*x-5/6*3*4*(1/5*x+3)-4*4*x = 0
13*x-16*x-30 = 0
-3*x-30 = 0
(-3*x-30)/(3*4) = 0
(-3*x-30)/(3*4) = 0 // * 3*4
-3*x-30 = 0
-3*x-30 = 0 // + 30
-3*x = 30 // : -3
x = 30/(-3)
x = -10
x = -10
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