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3*x-12 = 11*x-((1/2)*y) // - 11*x-((1/2)*y)
3*x-(11*x)+(1/2)*y-12 = 0
3*x-11*x+(1/2)*y-12 = 0
1/2*y-8*x-12 = 0 // - 1/2*y-12
-8*x = -(1/2*y-12) // : -8
x = (-(1/2*y-12))/(-8)
x = (12-(1/2*y))/(-8)
x = (12-(1/2*y))/(-8)
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