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(2/3)*(-2*x-2) = x-13 // - x-13
(2/3)*(-2*x-2)-x+13 = 0
2/3*(-2*x-2)-x+13 = 0
2/3*(-2*x-2)-x+13 = 0
13-7/3*x-4/3 = 0
35/3-7/3*x = 0
35/3-7/3*x = 0
35/3-7/3*x = 0 // - 35/3
-7/3*x = -35/3 // : -7/3
x = -35/3/(-7/3)
x = 5
x = 5
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