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27 = (1/2)*(135-x) // - (1/2)*(135-x)
27-((1/2)*(135-x)) = 0
(-1/2)*(135-x)+27 = 0
27-1/2*(135-x) = 0
27-1/2*(135-x) = 0
1/2*x-81/2 = 0
1/2*x-81/2 = 0
1/2*x-81/2 = 0 // + 81/2
1/2*x = 81/2 // : 1/2
x = 81/2/1/2
x = 81
x = 81
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