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y+7 = (-1/6)*(x-3) // - (-1/6)*(x-3)
y-((-1/6)*(x-3))+7 = 0
(1/6)*(x-3)+y+7 = 0
1/6*(x-3)+y+7 = 0
1/6*(x-3)+y+7 = 0
1/6*x+y-1/2+7 = 0
1/6*x+y+13/2 = 0
1/6*x+y+13/2 = 0
1/6*x+y+13/2 = 0 // - y+13/2
1/6*x = -(y+13/2) // : 1/6
x = (-(y+13/2))/1/6
x = -6*(y+13/2)
x = -6*(y+13/2)
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