Solution: 3x=40-25

3x= 15

x=5

4/5x+ 1/2x = 13/ 10

Solution:13/10x =13/10.

x= 1

1.3x-0.4×3= 1.4

Solution:1.3x-1.2 =1.4.

1.3x=2.6

x=2

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