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(2/5)*x-((9/25)*x) = 4 // - 4
(2/5)*x-((9/25)*x)-4 = 0
(2/5)*x+(-9/25)*x-4 = 0
1/25*x-4 = 0 // + 4
1/25*x = 4 // : 1/25
x = 4/1/25
x = 100
x = 100
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