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(1/2)*(27-x) = (1/10)*(7*x-54)+9/2 // - (1/10)*(7*x-54)+9/2
(1/2)*(27-x)-((1/10)*(7*x-54))-(9/2) = 0
(1/2)*(27-x)+(-1/10)*(7*x-54)-9/2 = 0
1/2*(27-x)-1/10*(7*x-54)-9/2 = 0
(1/2*2*(27-x))/2+(-1/10*2*(7*x-54))/2-9/2 = 0
1/2*2*(27-x)-1/10*2*(7*x-54)-9 = 0
189/5-12/5*x-9 = 0
144/5-12/5*x = 0
(144/5-12/5*x)/2 = 0
(144/5-12/5*x)/2 = 0 // * 2
144/5-12/5*x = 0
144/5-12/5*x = 0 // - 144/5
-12/5*x = -144/5 // : -12/5
x = -144/5/(-12/5)
x = 12
x = 12
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