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(1/4)*(18*x-36) = 27 // - 27
(1/4)*(18*x-36)-27 = 0
1/4*(18*x-36)-27 = 0
1/4*(18*x-36)-27 = 0
9/2*x-36 = 0
9/2*x-36 = 0
9/2*x-36 = 0 // + 36
9/2*x = 36 // : 9/2
x = 36/9/2
x = 8
x = 8
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