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(1/5)*(25*x-75)+9 = 0
1/5*(25*x-75)+9 = 0
1/5*(25*x-75)+9 = 0
5*x-6 = 0
5*x-6 = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
x = 6/5
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