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cybercobra434
The equation would be 5+4x=7x+11
Which comes out to:
x = - 2
nobrains
Let n represent the number.
Remember "plus" is addition, "times" is multiplication, "equal to" is =, and "sum" is addition.

5 + 4n = 7n + 11
   -  4n   -4n

5 = 3n + 11
-11       -11

-6 = 3n
n = -2