Answer:
Explanation:
20 = 12 + 16 + 2x
20 - 12 - 16 = 2x
-8 = 2x
x = -4
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check
20 = 12 + 16 + 2*-4
20 = 20
the answer is good
HI + IJ = HJ
=> x + 12 + 16 + x = 20
<=> 2x + 28 = 20
<=> 2x = -8
<=> x = -4
with x = -4 => HI = - 4 + 12 = 8
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