Answer:
7x-5 in
Explanation:
(8x + 2)+(5x+12)+(8x + 2)+?=28x+11
8x+2+5x+12+8x+2+?=28x+11
8x+5x+8x+2+12+2+?=28x+11
13x+8x+16+?=28x+11
21x+16+?=28x+11
21x-21x+16+?=28x-21x+11
16+?=7x+11
16-16+?=7x+11-16
?=7x-5 in
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