Subtract: 6xy from − 12xy

- 12xy - (6xy) = -18xy

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Simplify combining like terms: - z² + 13z² − 5z + 7z³ − 15z

Add: -7mn + 5, 12mn + 2, 9mn - 8, -2mn - 3

What should be taken away from 3x² - 4y² + 5xy + 20 to obtain - x² - y2 + 6xy + 20?

Subtract the sum of 3l − 4m − 7n² and 2l + 3m − 4n² from the sum of 9l + 2m − 3n² and − 3l + m + 4n² .....

Add:

17a²b²+ 16c; 28c − 28a²b²

Solve:

(6a − 5b − 8c) + (15b + 2a − 5c)

Add the following expressions:

p² – q + r, q² – r + p and r² – p + q

Add the following expressions:

p² – q + r, q² – r + p and r² – p + q

Add the following expressions:

x³y² + x²y³ + 3y⁴ and x⁴ + 3x²y³ + 4y⁴

Write two different algebraic expressions for the word phrase “`(1/4)` of the sum of x and 7.”