5-2(4-2x)=21 First we distribute

5-(2(4)-2(2x))=21 Continue distributing

5-(8-4x) = 21 Change the sign of everything we are subtracting

5 - 8 + 4x = 21 Simplify

-3 + 4x = 21 Add 3 to both sides

-3 + 3 + 4x = 21 + 3 simplify

4x = 24 Divide by 4

x = 6 Our answer. Check 5-2(4-2(6))=5-2(4-12)=5-2(-8)=5-(-16)=5+16=21

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