Question

subtracted-q+2r from the sum of p-10r and 2p +5p
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Answer 1

$\large\sf\underline{Sum \: of \: p-10r \:and\: 2p+5p}$

$p - 10r + 2p + 5p \\ \\ = p + 2p + 5p - 10r \\ \\ = 8p - 10r \\ \\ = 2(4p - 5r)$

$\large\sf\underline{Subtracting\:-q+2r \:from2(4p-5r)}$

$2(4p - 5r) - ( - q + 2r) \\ \\ = 8p - 10r + q - 2r \\ \\ = 8p - 12r + q$

Thnku !