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x in (-oo:+oo)
y = (7/9)*x+2 // - (7/9)*x+2
y-((7/9)*x)-2 = 0
(-7/9)*x+y-2 = 0
y-7/9*x-2 = 0 // - y-2
-7/9*x = -(y-2) // : -7/9
x = (-(y-2))/(-7/9)
x = -9/7*(2-y)
x = -9/7*(2-y)
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