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(2/5)*x+1/3 = x-(1/105) // - x-(1/105)
(2/5)*x-x+1/3+1/105 = 0
12/35-3/5*x = 0 // - 12/35
-3/5*x = -12/35 // : -3/5
x = -12/35/(-3/5)
x = 4/7
x = 4/7
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