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(2/3)*x-(71/2) = 3*x // - 3*x
(2/3)*x-(3*x)-(71/2) = 0
(2/3)*x-3*x-71/2 = 0
-7/3*x-71/2 = 0 // + 71/2
-7/3*x = 71/2 // : -7/3
x = 71/2/(-7/3)
x = -213/14
x = -213/14
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