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5*x-(7*x)+1 = -11 // + 11
5*x-(7*x)+1+11 = 0
5*x-7*x+1+11 = 0
12-2*x = 0 // - 12
-2*x = -12 // : -2
x = -12/(-2)
x = 6
x = 6
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