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