Answer:
20
Explanation:
Combine like terms: 5x + 3x = 8x
Divide both sides by 8: 8x/4; 32/8
Solve for x: x = 4
Plug it in: DE = 5(4) = 20
Check: 5(4) + 3(4) = 32; 20 + 12 = 32
15
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