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x in (-oo:+oo)
y-7 = (4/9)*(x+1) // - (4/9)*(x+1)
y-((4/9)*(x+1))-7 = 0
(-4/9)*(x+1)+y-7 = 0
y-4/9*(x+1)-7 = 0
y-4/9*(x+1)-7 = 0
y-4/9*x-7-4/9 = 0
y-4/9*x-67/9 = 0
y-4/9*x-67/9 = 0
y-4/9*x-67/9 = 0 // - y-67/9
-4/9*x = -(y-67/9) // : -4/9
x = (-(y-67/9))/(-4/9)
x = -9/4*(67/9-y)
x = -9/4*(67/9-y)
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