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They are: x and y and the expression can be simplified to 6xy
'y' is a variable. '15' is not. [ y+15 ] is an expression in one variable.
Terme und variablen (2)
In the expression 5 + y + 8, y is a variable. We know how much 5 and 8 are, those are definite quantities. Only y has an unknown, and hence variable value.
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