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11-((1/2)*y) = 6*x+3 // - 6*x+3
11-(6*x)-((1/2)*y)-3 = 0
(-1/2)*y-6*x-3+11 = 0
8-6*x-1/2*y = 0 // - 8-1/2*y
-6*x = -(8-1/2*y) // : -6
x = (-(8-1/2*y))/(-6)
x = (8-1/2*y)/6
x = (8-1/2*y)/6
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