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(1/4)*(2*x-6) = 7 // - 7
(1/4)*(2*x-6)-7 = 0
1/4*(2*x-6)-7 = 0
1/4*(2*x-6)-7 = 0
1/2*x-17/2 = 0
1/2*x-17/2 = 0
1/2*x-17/2 = 0 // + 17/2
1/2*x = 17/2 // : 1/2
x = 17/2/1/2
x = 17
x = 17
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