7
3+4=7+0=7
It equals 7
4x+7=9x+7 -5x=0 x=0
15*0=0 0*13=0 0+7=7 The answer is 7
?+14=7+7 ?=0 7+7=14
The answer is-7. 3+(-3)=0 0+(-7)=-7
If you put the numbers in order it is: 0, 0, 1, 2, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 9. Since there are 25 numbers, we are looking for the thirteenth number, which is 5.
7
2x = -7 - 8y
Zero is the identity under addition.
0