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x in (-oo:+oo)
y+5 = (-1/6)*(x+7) // - (-1/6)*(x+7)
y-((-1/6)*(x+7))+5 = 0
(1/6)*(x+7)+y+5 = 0
1/6*(x+7)+y+5 = 0
1/6*(x+7)+y+5 = 0
1/6*x+y+7/6+5 = 0
1/6*x+y+37/6 = 0
1/6*x+y+37/6 = 0
1/6*x+y+37/6 = 0 // - y+37/6
1/6*x = -(y+37/6) // : 1/6
x = (-(y+37/6))/1/6
x = -6*(y+37/6)
x = -6*(y+37/6)
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