Final answer to the problem
$8a^2-12ab-11$
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1
Apply the formula: $a+b$$=a+b$, where $a=20$, $b=-31$ and $a+b=15a^2-6ab-8a^2+20-5ab-31+a^2-ab$
$15a^2-6ab-8a^2-11-5ab+a^2-ab$
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$15a^2-6ab-8a^2-11-5ab+a^2-ab$
Learn how to solve simplification des expressions algébriques problems step by step online. 15a^2-6ab-8a^2+20-5ab+-31a^2-ab. Apply the formula: a+b=a+b, where a=20, b=-31 and a+b=15a^2-6ab-8a^2+20-5ab-31+a^2-ab. Combining like terms 15a^2 and -8a^2. Combining like terms 7a^2 and a^2. Combining like terms -6ab and -5ab.
Final answer to the problem
$8a^2-12ab-11$
