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7-x = (-1/26)*x-(2*3) // - (-1/26)*x-(2*3)
2*3-x-((-1/26)*x)+7 = 0
(1/26)*x-x+2*3+7 = 0
13-25/26*x = 0 // - 13
-25/26*x = -13 // : -25/26
x = -13/(-25/26)
x = 338/25
x = 338/25
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