The sum of 7 and x is represented by the expression 7 + x. In algebra, when we add a constant (like 7) to a variable (like x), we cannot simplify it further unless we know the specific value of x. Therefore, the sum of 7 and x is simply 7 + x.
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7+x, because these are not like terms, they cannot be combined.
X/(y+7)
this is actually an equation let the 'sum' be x we are assuming r means are meaning = so x/6 = 7 x=42 so thats the answer
x/3 + 7 = 5 x/3 = -2 x = -6
x+7=y
7 + 2x = x + 10 so 2x - x = 10 - 7 x = 3