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7*x-(5*x)-(1/10) = 3*x+1/5+5/15 // - 3*x+1/5+5/15
7*x-(5*x)-(3*x)-(1/10)-(1/5)-(5/15) = 0
7*x-5*x-3*x-1/10-1/5-1/3 = 0
-x-19/30 = 0 // + 19/30
-x = 19/30 // * -1
x = -19/30
x = -19/30
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