Solution 3x= 152-26

3x= 126

x=42

3 、( 1)3x+20 = 80(2) 120-7x = 50

Solution 3x=60 Solution 7x= 120-50

x=20 7x=70

x= 10

4. solution: let table tennis x yuan.

5 1+4x=59

4x=8

X=2 A: 2 yuan for each table tennis.

5. Solution: Settings; There are x pear trees.

3x+x+20=340

4x=340-20

4x=320 3*80+20=260 trees

X=80: 80 pear trees and 260 peach trees.

6. solution: let the elephant be x years old.

100+200x=4 100

200x=4000

X=20 A: the elephant is 20 years old.

7.(92+24)*2=232 pages A: Storybook1* * has 324 pages.

I hope I can help you! O(∩_∩)O hahaha ~