add 5p-q^2+13r^2,6r^2+7p+4q^2,8q^2-6p-7r^2
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Step-by-step explanation:
5p + 7p - 6p - q^2 +4q^2 + 8q^2 + 13r^2 + 6r^2 + 7r^2
6p + 11q^2 + 26r^2
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