'y' is a variable. '15' is not.
[ y+15 ] is an expression in one variable.
(A/15)+(4/15)=(a/15) You can multiply both sides of the equal sign by fifteen to get A+4=a But you cannot simplify it any further because you have two variables.
15d + 7 = 7d + 15 is an equation in one variable, d.
positive 10
Its 91
15
In the expression y+15, there is one variable, the "y."
the variable is Y
(A/15)+(4/15)=(a/15) You can multiply both sides of the equal sign by fifteen to get A+4=a But you cannot simplify it any further because you have two variables.
25 plus 52 plus 15 is equal to 92.
37
15d + 7 = 7d + 15 is an equation in one variable, d.
-17.
positive 10
Its 91
139
15
Yes, 15 + 15 = 30