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a in (-oo:+oo)
a-((4*(a-4))/6)-(5/4) = 5*a+25/3 // - 5*a+25/3
a-((4*(a-4))/6)-(5*a)-(5/4)-(25/3) = 0
(-2/3)*(a-4)+a-5*a-5/4-25/3 = 0
a-2/3*(a-4)-5*a-5/4-25/3 = 0
(-2/3*3*4*(a-4))/(3*4)+(3*4*a)/(3*4)+(-5*3*4*a)/(3*4)+(-5*3)/(3*4)+(-25*4)/(3*4) = 0
3*4*a-2/3*3*4*(a-4)-5*3*4*a-5*3-25*4 = 0
4*a-60*a-100-15+32 = 0
32-56*a-100-15 = 0
17-56*a-100 = 0
-56*a-83 = 0
(-56*a-83)/(3*4) = 0
(-56*a-83)/(3*4) = 0 // * 3*4
-56*a-83 = 0
-56*a-83 = 0 // + 83
-56*a = 83 // : -56
a = 83/(-56)
a = -83/56
a = -83/56
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