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x in (-oo:+oo)
4*x = y/3 // - y/3
4*x-(y/3) = 0
4*x-1/3*y = 0 // + -1/3*y
4*x = -(-1/3*y) // : 4
x = (-(-1/3*y))/4
x = 1/12*y
x = 1/12*y
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