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7-(2*x)-(2/3) = 15 // - 15
7-(2*x)-(2/3)-15 = 0
7-2*x-2/3-15 = 0
-2*x-26/3 = 0 // + 26/3
-2*x = 26/3 // : -2
x = 26/3/(-2)
x = -13/3
x = -13/3
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