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7-((2/5)*x) = 5 // - 5
7-((2/5)*x)-5 = 0
(-2/5)*x-5+7 = 0
2-2/5*x = 0 // - 2
-2/5*x = -2 // : -2/5
x = -2/(-2/5)
x = 5
x = 5
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