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2 + 2 + x - 7 = 21
11 + x = 21

We have to subtract 11 on both sides to isolate x

11 ( - 11 ) + x = 21 ( - 11 )
11 and 11 cancels out

x = 10

combine like terms

2+2-7=-3

X-3= 21

+3      +3

X=24

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