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(1/5)*x-9 = 3/4 // - 3/4
(1/5)*x-(3/4)-9 = 0
(1/5)*x-3/4-9 = 0
1/5*x-39/4 = 0 // + 39/4
1/5*x = 39/4 // : 1/5
x = 39/4/1/5
x = 195/4
x = 195/4
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