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y+5 = (-1/7)*(x-9) // - (-1/7)*(x-9)
y-((-1/7)*(x-9))+5 = 0
(1/7)*(x-9)+y+5 = 0
1/7*(x-9)+y+5 = 0
1/7*(x-9)+y+5 = 0
1/7*x+y-9/7+5 = 0
1/7*x+y+26/7 = 0
1/7*x+y+26/7 = 0
1/7*x+y+26/7 = 0 // - y+26/7
1/7*x = -(y+26/7) // : 1/7
x = (-(y+26/7))/1/7
x = -7*(y+26/7)
x = -7*(y+26/7)
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