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(-4/5)*(9*x-20)-(3*x) = 4/5-6 // - 4/5-6
(-4/5)*(9*x-20)-(3*x)-(4/5)+6 = 0
(-4/5)*(9*x-20)-3*x-4/5+6 = 0
6-4/5*(9*x-20)-3*x-4/5 = 0
(-4/5*5*(9*x-20))/5+(-3*5*x)/5-4/5+(5*6)/5 = 0
5*6-4/5*5*(9*x-20)-3*5*x-4 = 0
30-51*x-4+80 = 0
30-51*x+76 = 0
106-51*x = 0
(106-51*x)/5 = 0
(106-51*x)/5 = 0 // * 5
106-51*x = 0
106-51*x = 0 // - 106
-51*x = -106 // : -51
x = -106/(-51)
x = 106/51
x = 106/51
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