One mark exercise problems I — task. Mathematics State Board, Class 7.

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1. The generalization of the number pattern

$3$ ,

$6$ ,

$9$ ,

$12$ , ... is .

2. The solution of

$3x + 5 = x + 9$ is .

3. The equation

$y + 1 = 0$ is true only when

$y$ is .

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