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(3/4)*(5-(1*x)) = 0.75*x-((81/2)*x)-9 // - 0.75*x-((81/2)*x)-9
(3/4)*(5-(1*x))-(0.75*x)+(81/2)*x+9 = 0
(3/4)*(5-x)-0.75*x+(81/2)*x+9 = 0
3/4*(5-x)-0.75*x+(81*x)/2+9 = 0
(3/4*2*(5-x))/2+(-0.75*2*x)/2+(81*x)/2+(2*9)/2 = 0
3/4*2*(5-x)-0.75*2*x+81*x+2*9 = 0
81*x-3*x+15/2+18 = 0
78*x+15/2+18 = 0
78*x+51/2 = 0
(78*x+51/2)/2 = 0
(78*x+51/2)/2 = 0 // * 2
78*x+51/2 = 0
78*x+51/2 = 0 // - 51/2
78*x = -51/2 // : 78
x = -51/2/78
x = -17/52
x = -17/52
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