Respuesta :

MikeMart77

[tex]31x+40=200-x\\32x=160\\x=160/32\\x=5[/tex]

The number is 5.

gmany

n - a number

31 times a number is increased by 40 is equal 200 is decreased by the number

31n + 40 = 200 - n      subtract 40 from both sides

31n = 160 - n      add n to both sides

32n = 160     divide both sides by 32

n = 5

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good job