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x in (-oo:+oo)
y = (1/3)*x+7 // - (1/3)*x+7
y-((1/3)*x)-7 = 0
(-1/3)*x+y-7 = 0
y-1/3*x-7 = 0 // - y-7
-1/3*x = -(y-7) // : -1/3
x = (-(y-7))/(-1/3)
x = -3*(7-y)
x = -3*(7-y)
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