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x in (-oo:+oo)
y/3 = x+7 // - x+7
y/3-x-7 = 0
1/3*y-x-7 = 0 // - 1/3*y-7
-x = -(1/3*y-7) // * -1
x = 1/3*y-7
x = 1/3*y-7
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