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10-((2/5)*x) = 252/25 // - 252/25
10-((2/5)*x)-(252/25) = 0
(-2/5)*x-252/25+10 = 0
-2/5*x-2/25 = 0 // + 2/25
-2/5*x = 2/25 // : -2/5
x = 2/25/(-2/5)
x = -1/5
x = -1/5
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