X+3=8
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n+3 the sum of a number and three means a number plus three.
in the equation 3+4=7, 3 and 4 are the addends. 7 is the sum.
It means that some number is having 14 added to it. The sum of 3 and 14, for example is 3 + 14.
If: 9+x = 3 then x = -6
The associative property means that in a sum (for example), (1 + 2) + 3 = 1 + (2 + 3). In other words, you can add on the left first, or on the right first, and get the same result. Similar for multiplication. How you use this in an equation depends on the equation.