Actually, 2x + 3y + z is an expression, because it is a mathematical noun.
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2x/3y
To simplify the expression 2x + 3y + 4x + 9y, you first combine like terms. Adding the coefficients of x terms gives 2x + 4x = 6x. Similarly, adding the coefficients of y terms gives 3y + 9y = 12y. Therefore, the simplified expression is 6x + 12y.
There are three terms in the given expression
6x + 3y + 6y - 2x = (6x - 2x) + (3y + 6y) = 4x + 9y
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