Solve for x
x=3
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10x+4-21=13
Combine 2x and 8x to get 10x.
10x-17=13
Subtract 21 from 4 to get -17.
10x=13+17
Add 17 to both sides.
10x=30
Add 13 and 17 to get 30.
x=\frac{30}{10}
Divide both sides by 10.
x=3
Divide 30 by 10 to get 3.
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