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(13*x)/3-(7*x)-(6/3) = 0
(13*x)/3-7*x-2 = 0
-8/3*x-2 = 0 // + 2
-8/3*x = 2 // : -8/3
x = 2/(-8/3)
x = -3/4
x = -3/4
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