Solve for A_2
A_{2}=1970-z
Solve for z
z=1970-A_{2}
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A_{2}+z=2000-30
Subtract 30 from both sides.
A_{2}+z=1970
Subtract 30 from 2000 to get 1970.
A_{2}=1970-z
Subtract z from both sides.
30+z=2000-A_{2}
Subtract A_{2} from both sides.
z=2000-A_{2}-30
Subtract 30 from both sides.
z=1970-A_{2}
Subtract 30 from 2000 to get 1970.
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