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(1/2)*(4*x-7) = 1 // - 1
(1/2)*(4*x-7)-1 = 0
1/2*(4*x-7)-1 = 0
1/2*(4*x-7)-1 = 0
2*x-9/2 = 0
2*x-9/2 = 0
2*x-9/2 = 0 // + 9/2
2*x = 9/2 // : 2
x = 9/2/2
x = 9/4
x = 9/4
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