Solve for x_15
x_{15}=4
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2x_{15}=12-4
Subtract 4 from both sides.
2x_{15}=8
Subtract 4 from 12 to get 8.
x_{15}=\frac{8}{2}
Divide both sides by 2.
x_{15}=4
Divide 8 by 2 to get 4.
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