1.x-2x+2x-2+x+x+2=66

2.a+3(a+3)* 1/3=9-3

3. Solution: Set up a class to plant X trees.

2x+ 1+x=3 1。

x= 10

X is the solution of the equation, which accords with the meaning of the question.

1 class: 10*2+ 1=2 1 (tree)

A: Yes. . . . .

4. Solution: Set up a fruit merchant and buy X boxes of fruit.

30x=40*(x/2+5)

x=200

Test: x=20 is the solution of the equation, which accords with the meaning of the question.

Answer:. . .

5. Solution: Let the total length of the car body be x meters.

4700+x= 1200*4

x= 100

X= 100 is the solution of the equation, which accords with the meaning of the question.

A: Yes. . .

6.( 1) Solution: We caught up with Xiaoming x minutes after departure.

80*5+80x= 180x

x=4

Inspection; X=4 is the solution of the equation, which accords with the meaning of the question.

A: Yes. . .

(2) 1000- 180x

= 1000- 180*4

=280 meters

Answer:. .