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x in (-oo:+oo)
y = (7/9)*x-1 // - (7/9)*x-1
y-((7/9)*x)+1 = 0
(-7/9)*x+y+1 = 0
y-7/9*x+1 = 0 // - y+1
-7/9*x = -(y+1) // : -7/9
x = (-(y+1))/(-7/9)
x = 9/7*(y+1)
x = 9/7*(y+1)
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