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Hey there,
Answer:
k(a + b) = ka + kb
2(3r + 7) - (2+ r)
= 2*3r + 2*7 - (2 + r)
= 6r + 14 - (2 + r)
= 6r + 14 - 2 - r
= 6r - r + 14 - 2
= 5r + 12
;)✅