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On page 66 of the first volume of fifth grade mathematics, exercise 12, questions 2 and 3 are done with equations.
2. An X-ray tube is installed in the solution.

5x+3= 1428

5x+3-3= 1428-3

5 x= 1425

5x \5 = 1425 \5

x=285

3. Solution: Let Tiananmen Square cover an area of X million square meters.

2x- 16=72

2x- 16+ 16 = 72+ 16

2x=88

2x \2 = 88 \2

x=44