Solve for x
x=4
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\frac{28}{4}=3+x
Divide both sides by 4.
7=3+x
Divide 28 by 4 to get 7.
3+x=7
Swap sides so that all variable terms are on the left hand side.
x=7-3
Subtract 3 from both sides.
x=4
Subtract 3 from 7 to get 4.
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