If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x = (4/9)*y-1 // - (4/9)*y-1
x-((4/9)*y)+1 = 0
x+(-4/9)*y+1 = 0
x-4/9*y+1 = 0 // - 1-4/9*y
x = -(1-4/9*y)
x = -(1-4/9*y)
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