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a in (-oo:+oo)
(-7/4)*((5/4)*a+1)+7/6 = (7/5)*a-1561/1200 // - (7/5)*a-1561/1200
(-7/4)*((5/4)*a+1)-((7/5)*a)+7/6-(-1561/1200) = 0
(-7/4)*((5/4)*a+1)+(-7/5)*a+7/6+1561/1200 = 0
(-7*a)/5-7/4*(5/4*a+1)+7/6+1561/1200 = 0
(-7/4*5*6*1200*(5/4*a+1))/(5*6*1200)+(-7*6*1200*a)/(5*6*1200)+(5*7*1200)/(5*6*1200)+(5*6*1561)/(5*6*1200) = 0
5*7*1200-7/4*5*6*1200*(5/4*a+1)-7*6*1200*a+5*6*1561 = 0
42000-129150*a-63000+46830 = 0
46830-129150*a-21000 = 0
25830-129150*a = 0
(25830-129150*a)/(5*6*1200) = 0
(25830-129150*a)/(5*6*1200) = 0 // * 5*6*1200
25830-129150*a = 0
25830-129150*a = 0 // - 25830
-129150*a = -25830 // : -129150
a = -25830/(-129150)
a = 1/5
a = 1/5
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