'y' is a variable. '15' is not.
[ y+15 ] is an expression in one variable.
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(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.
15
Its 91
positive 10