Zero because 0 times 9 = 0
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That completely depends on the value of 'x'. Whatever 'x' happens to be at the moment, you must add to this expression an amount equal to triple-x less than 7. In other words, the expression [ 7 - 3x ] must be added.
-13 is the number must you subtract from -13 to get a difference of 0
It depends on what the first # is because you always add the opposite to the first number and then it = 0. For instance -3+3=0 see how a negative was added to the positive? or it could go like this: 6+(-6)=0
it is the number such that 15 added to negative 15=0
0 and 0 You cannot dived by 0 (zero)