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(2/3)*(6-x) = -3 // + 3
(2/3)*(6-x)+3 = 0
2/3*(6-x)+3 = 0
2/3*(6-x)+3 = 0
7-2/3*x = 0
7-2/3*x = 0
7-2/3*x = 0 // - 7
-2/3*x = -7 // : -2/3
x = -7/(-2/3)
x = 21/2
x = 21/2
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