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(2/5)*x-((9/25)*x) = 5 // - 5
(2/5)*x-((9/25)*x)-5 = 0
(2/5)*x+(-9/25)*x-5 = 0
1/25*x-5 = 0 // + 5
1/25*x = 5 // : 1/25
x = 5/1/25
x = 125
x = 125
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