Solve for x
x = \frac{17}{2} = 8\frac{1}{2} = 8.5
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2x+1+3=21
Combine x and x to get 2x.
2x+4=21
Add 1 and 3 to get 4.
2x=21-4
Subtract 4 from both sides.
2x=17
Subtract 4 from 21 to get 17.
x=\frac{17}{2}
Divide both sides by 2.
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