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(-3/7)*x-1 = 2*x-(211/7) // - 2*x-(211/7)
(-3/7)*x-(2*x)+211/7-1 = 0
(-3/7)*x-2*x+211/7-1 = 0
204/7-17/7*x = 0 // - 204/7
-17/7*x = -204/7 // : -17/7
x = -204/7/(-17/7)
x = 12
x = 12
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