Solve for x
x = \frac{21}{2} = 10\frac{1}{2} = 10.5
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17=2x-4
Subtract 3 from 20 to get 17.
2x-4=17
Swap sides so that all variable terms are on the left hand side.
2x=17+4
Add 4 to both sides.
2x=21
Add 17 and 4 to get 21.
x=\frac{21}{2}
Divide both sides by 2.
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