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x in (-oo:+oo)
(2/3)*x-(6/12) = 0*x // - 0*x
(2/3)*x-(0*x)-(6/12) = 0
(2/3)*x-1/2 = 0
2/3*x-1/2 = 0 // + 1/2
2/3*x = 1/2 // : 2/3
x = 1/2/2/3
x = 3/4
x = 3/4
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