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13/2-(x/3) = 4*x // - 4*x
13/2-(x/3)-(4*x) = 0
13/2-(x/3)-4*x = 0
13/2-13/3*x = 0 // - 13/2
-13/3*x = -13/2 // : -13/3
x = -13/2/(-13/3)
x = 3/2
x = 3/2
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