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(1/2)*(5*x-9) = 7 // - 7
(1/2)*(5*x-9)-7 = 0
1/2*(5*x-9)-7 = 0
1/2*(5*x-9)-7 = 0
5/2*x-23/2 = 0
5/2*x-23/2 = 0
5/2*x-23/2 = 0 // + 23/2
5/2*x = 23/2 // : 5/2
x = 23/2/5/2
x = 23/5
x = 23/5
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