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(1/2)*(x-6) = 90 // - 90
(1/2)*(x-6)-90 = 0
1/2*(x-6)-90 = 0
1/2*(x-6)-90 = 0
1/2*x-93 = 0
1/2*x-93 = 0
1/2*x-93 = 0 // + 93
1/2*x = 93 // : 1/2
x = 93/1/2
x = 186
x = 186
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