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(1/5)*(5*x-9) = 4 // - 4
(1/5)*(5*x-9)-4 = 0
1/5*(5*x-9)-4 = 0
1/5*(5*x-9)-4 = 0
x-29/5 = 0
x-29/5 = 0
x-29/5 = 0 // + 29/5
x = 29/5
x = 29/5
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