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(7-(2*x))/5 = -1 // + 1
(7-(2*x))/5+1 = 0
(7-2*x)/5+1 = 0
(7-2*x)/5+(1*5)/5 = 0
1*5-2*x+7 = 0
12-2*x = 0
(12-2*x)/5 = 0
(12-2*x)/5 = 0 // * 5
12-2*x = 0
12-2*x = 0 // - 12
-2*x = -12 // : -2
x = -12/(-2)
x = 6
x = 6
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