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y+9 = (6/7)*x-(54/7) // - (6/7)*x-(54/7)
y-((6/7)*x)+54/7+9 = 0
(-6/7)*x+y+54/7+9 = 0
y-6/7*x+117/7 = 0 // - y+117/7
-6/7*x = -(y+117/7) // : -6/7
x = (-(y+117/7))/(-6/7)
x = 7/6*(y+117/7)
x = 7/6*(y+117/7)
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