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5*((2/25)*x-(4/5)) = 0
5*((2/25)*x-4/5) = 0
5*(2/25*x-4/5) = 0
2/25*x-4/5 = 0 // + 4/5
2/25*x = 4/5 // : 2/25
x = 4/5/2/25
x = 10
x = 10
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