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x in (-oo:+oo)
(1/3)*(3*x+27) = 4*x // - 4*x
(1/3)*(3*x+27)-(4*x) = 0
(1/3)*(3*x+27)-4*x = 0
1/3*(3*x+27)-4*x = 0
1/3*(3*x+27)-4*x = 0
9-3*x = 0
9-3*x = 0
9-3*x = 0 // - 9
-3*x = -9 // : -3
x = -9/(-3)
x = 3
x = 3
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