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2/7 = 3*x-(7*x)-(10/15) // - 3*x-(7*x)-(10/15)
7*x-(3*x)+2/7+10/15 = 0
7*x-3*x+2/7+10/15 = 0
4*x+20/21 = 0 // - 20/21
4*x = -20/21 // : 4
x = -20/21/4
x = -5/21
x = -5/21
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