Solve for a
a=30
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7\times 3+9=a
Multiply both sides of the equation by 3.
21+9=a
Multiply 7 and 3 to get 21.
30=a
Add 21 and 9 to get 30.
a=30
Swap sides so that all variable terms are on the left hand side.
Examples
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Matrix
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Simultaneous equation
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Limits
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