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x in (-oo:+oo)
y+10 = (-6/3)*(x+4) // - (-6/3)*(x+4)
y-((-6/3)*(x+4))+10 = 0
2*(x+4)+y+10 = 0
2*(x+4)+y+10 = 0
2*x+y+8+10 = 0
2*x+y+18 = 0
2*x+y+18 = 0
2*x+y+18 = 0 // - y+18
2*x = -(y+18) // : 2
x = (-(y+18))/2
x = (-(y+18))/2
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