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The expression -26r + 7r15p7p can be simplified by combining like terms.
To simplify this expression, we can start by combining the coefficients of the terms that have the same variables.
The terms -26r and 7r both have the variable 'r', so we can combine their coefficients. -26r + 7r equals -19r.
Now let's look at the other part of the expression, 7r15p7p. This is a simplified form of 7r * 15p * 7p.
To simplify this further, we can multiply the coefficients and add the exponents of the variables.
7r15p7p = 7 * r^1 * (15 * p^1) * (7 * p^1)
Simplifying the coefficients, we get: 7 * 15 * 7 = 735.
And combining the variables, we get: r^1 * p^1 * p^1 = r * p^2.
Combining everything, we have: 7r15p7p = 735r * p^2.
Now we can combine this simplified term with the -19r term:
-19r + 735r * p^2
And that is the simplified form of the expression -26r + 7r15p7p.