Solve for x
x=11
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7+2+x=20
Add 3 and 4 to get 7.
9+x=20
Add 7 and 2 to get 9.
x=20-9
Subtract 9 from both sides.
x=11
Subtract 9 from 20 to get 11.
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Matrix
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Simultaneous equation
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Limits
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