That would be called Addition.
7 takeaway something equals 5
23 add something equals 100 = 123
Something equals 40.
47
2 -.-
There is no such numbers.If you used 9 and -4 then you will get 5 when you add them but you will get -36 when you multiply them.
13 add something equals 30 = 43
23 add something equals 100 = 123
5.3999999999999995
92.97999999999999
It is: 0.91 + 0.09 = 1
6+17=23
How do you add 2x plus 3y equals 18 in 5x-y equals 11
900-something equals 893 = 7
38 and divide4 equals something = 9.5
the answer is 6. add 2x to each side, you get 42=7x. divide 42 by 7. not difficult, this is a basic question, go to extra help or something at school.
Add 2.
Something equals 40.