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Find the missing number
7 + Δ = 10
Find the missing number
4 + Δ = 10
Find the missing number
5 + Δ = 10
Find the missing number
15 + Δ = 20
Find the missing number
23 + Δ = 30
Find the missing number
82 + Δ = 90
Find the missing number
110 + Δ = 130
Find the missing number
1 + Δ = 90