(x +2.4)–3=2.5忘记了,

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(x +2.4)–3=2.5忘记了,

(x +2.4)–3=2.5忘记了,
(x +2.4)–3=2.5
忘记了,

(x +2.4)–3=2.5忘记了,
(x +2.4)–3=2.5
x +2.4=2.5+3
X+2.4=5.5
X=5.5-2.4
X=3.1