Solve for x
x=3
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4\times 3=9+x
Multiply both sides by 3.
12=9+x
Multiply 4 and 3 to get 12.
9+x=12
Swap sides so that all variable terms are on the left hand side.
x=12-9
Subtract 9 from both sides.
x=3
Subtract 9 from 12 to get 3.
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