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y+5 = (-1/7)*x+3*(-1/7) // - (-1/7)*x+3*(-1/7)
y-((-1/7)*x)-(3*(-1/7))+5 = 0
(1/7)*x+y+3/7+5 = 0
1/7*x+y+38/7 = 0 // - y+38/7
1/7*x = -(y+38/7) // : 1/7
x = (-(y+38/7))/1/7
x = -7*(y+38/7)
x = -7*(y+38/7)
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