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5*x-(5*(-7/15)) = 7 // - 7
5*x-(5*(-7/15))-7 = 0
5*x+7/3-7 = 0
5*x-14/3 = 0 // + 14/3
5*x = 14/3 // : 5
x = 14/3/5
x = 14/15
x = 14/15
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