Question

A number increased by 4 is the same as 19 minus 2 times the number

Answer 1

So it says A NUMBER We don't know what number SO we are gonna add any variable you want.
LET SAYS m = NUMBER INCREASED
is means equal
m+4= 19-2m

m+2m=19-4
3m=19-4
3m=15
3÷3m=15÷3 3and 3 cancel each other and 15÷3 is 5
m=5
Answer is 5

Answer 2

Here :

x+4=19-2x
x+2x=19-4
3x=15/3
x=5