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