Question

Question #4a4b6

Answer 1

`(3+x)-2 = 1+x`

Explanation:

Consider the given equations in tabular form so we can see the pattern:
#color(white)("XXX"){: ("(",3, "+",color(red)(9),")", -2 ,"=",1,"+", color(red)(9)),("(",3, "+",color(red)(4),")", -2 ,"=",1,"+", color(red)(4)),("(",3, "+",color(red)(90),")", -2 ,"=",1,"+",color(red)( 90)) :}#

We can see that except for the two identical columns (in `color(red)("red")`) all the entries down the table are identical.
Therefore, the `color(red)("red")` entries become the variable and everything else are constants