Solve for x
x=12
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9+1x=21+0x
Multiply 0 and 8 to get 0.
9+1x=21+0
Anything times zero gives zero.
9+1x=21
Add 21 and 0 to get 21.
1x=21-9
Subtract 9 from both sides.
1x=12
Subtract 9 from 21 to get 12.
x=12
Reorder the terms.
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