formulas - finding what is "x"?

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Its been a while since i was at school - dont know if this relates to
"equations" but, which formula would i use if i wanted to calculate what the
value of "x" is? For example:

4 + x = 7

so the answer would be x = 3

Any ideas anyone???
 
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