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2*x-(7*x)-(x*((7*y)/6))-(x*((8*y)/2))+1 = 0
2*x-7*x+(-7/6)*x*y-4*x*y+1 = 0
1-31/6*x*y = 0 // - 1
-31/6*x*y = -1 // : -31/6*y
x = -1/(-31/6*y)
x = 6/31*y^-1
x = 6/31*y^-1
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