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x in (-oo:+oo)
x+(1/3)*y = 30 // - 30
x+(1/3)*y-30 = 0
x+1/3*y-30 = 0 // - 1/3*y-30
x = -(1/3*y-30)
x = 30-(1/3*y)
x = 30-(1/3*y)
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