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8*y+y-12-8 = 4*x+(1/4)*x-8 // - 4*x+(1/4)*x-8
8*y-(4*x)-((1/4)*x)+y-12-8+8 = 0
(-1/4)*x-4*x+8*y+y-12-8+8 = 0
9*y-17/4*x-12 = 0 // - 9*y-12
-17/4*x = -(9*y-12) // : -17/4
x = (-(9*y-12))/(-17/4)
x = -4/17*(12-(9*y))
x = -4/17*(12-(9*y))
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