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Explanation:
let the unknown be x
4(8 + x) = 32
32 + 4x = 32
4x = 32 - 32
4x = 0
x = 0 ÷ 4
x = 0
if you wanna check,
4(8 + 0)= 32
32 + 0 = 32
32 = 32
hope I got it right&^^,good luck!