3+d=11
d would have to be the number added to 3 that results in the answer 11. I can think of one: 8. Are there any others?
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a = 4
r + 11 + 8r = 29
You'll need another equation to solve this one. The equation you give has a graph that is a line. Every point on the line is a solution to the equation so there are infinitely many solutions.
-11=18+s/5
It is an equation and the value of n is 9