Solve for x_2
x_{2}=6
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40+20+x_{2}=66
Multiply 10 and 2 to get 20.
60+x_{2}=66
Add 40 and 20 to get 60.
x_{2}=66-60
Subtract 60 from both sides.
x_{2}=6
Subtract 60 from 66 to get 6.
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