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4/7-((2/5)*x) = 53/105 // - 53/105
4/7-((2/5)*x)-(53/105) = 0
(-2/5)*x+4/7-53/105 = 0
1/15-2/5*x = 0 // - 1/15
-2/5*x = -1/15 // : -2/5
x = -1/15/(-2/5)
x = 1/6
x = 1/6
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