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y-6 = (-3/7)*x-(27/7) // - (-3/7)*x-(27/7)
y-((-3/7)*x)+27/7-6 = 0
(3/7)*x+y+27/7-6 = 0
3/7*x+y-15/7 = 0 // - y-15/7
3/7*x = -(y-15/7) // : 3/7
x = (-(y-15/7))/3/7
x = 7/3*(15/7-y)
x = 7/3*(15/7-y)
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