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9-(a*((7*x)/8))-(5*a)-(a*((6*x)/8)) = 0
(-7/8)*a*x-5*a+(-3/4)*a*x+9 = 0
9-13/8*a*x-5*a = 0 // - 9-5*a
-13/8*a*x = -(9-5*a) // : -13/8*a
x = (-(9-5*a))/(-13/8*a)
x = 8/13*a^-1*(9-5*a)
x = 8/13*a^-1*(9-5*a)
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