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x in (-oo:+oo)
y+7 = (-1/4)*(x+7) // - (-1/4)*(x+7)
y-((-1/4)*(x+7))+7 = 0
(1/4)*(x+7)+y+7 = 0
1/4*(x+7)+y+7 = 0
1/4*(x+7)+y+7 = 0
1/4*x+y+7/4+7 = 0
1/4*x+y+35/4 = 0
1/4*x+y+35/4 = 0
1/4*x+y+35/4 = 0 // - y+35/4
1/4*x = -(y+35/4) // : 1/4
x = (-(y+35/4))/1/4
x = -4*(y+35/4)
x = -4*(y+35/4)
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