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x in (-oo:+oo)
(2/3)*x+1/4 = 3*x // - 3*x
(2/3)*x-(3*x)+1/4 = 0
(2/3)*x-3*x+1/4 = 0
1/4-7/3*x = 0 // - 1/4
-7/3*x = -1/4 // : -7/3
x = -1/4/(-7/3)
x = 3/28
x = 3/28
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