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