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3*x-(5*x)-(1/7)-(2/21) = 0
3*x-5*x-1/7-2/21 = 0
-2*x-5/21 = 0 // + 5/21
-2*x = 5/21 // : -2
x = 5/21/(-2)
x = -5/42
x = -5/42
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