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7/10 = (2/5)*x // - (2/5)*x
7/10-((2/5)*x) = 0
(-2/5)*x+7/10 = 0
7/10-2/5*x = 0 // - 7/10
-2/5*x = -7/10 // : -2/5
x = -7/10/(-2/5)
x = 7/4
x = 7/4
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