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The first volume of the fifth grade math book has 75 pages of answers.
1. Judge whether the following statements are completely correct.

The square of (1)a is greater than 2a. (error)

(2) Formulas containing unknowns are called equations. (error)

(3)5x+5=5(x+ 1) (right)

(4) The solution of equation 3x-6= 12 is 6 (right).