Solve for A
A=68
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20A+40-108=A\times 19
Use the distributive property to multiply A+2 by 20.
20A-68=A\times 19
Subtract 108 from 40 to get -68.
20A-68-A\times 19=0
Subtract A\times 19 from both sides.
A-68=0
Combine 20A and -A\times 19 to get A.
A=68
Add 68 to both sides. Anything plus zero gives itself.
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