Solve for A
A=20-s
Solve for s
s=20-A
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A+s=10\times 2
Multiply both sides by 2.
A+s=20
Multiply 10 and 2 to get 20.
A=20-s
Subtract s from both sides.
A+s=10\times 2
Multiply both sides by 2.
A+s=20
Multiply 10 and 2 to get 20.
s=20-A
Subtract A from both sides.
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