Solve for a
a=1
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20+a\times 5=25
Swap sides so that all variable terms are on the left hand side.
a\times 5=25-20
Subtract 20 from both sides.
a\times 5=5
Subtract 20 from 25 to get 5.
a=\frac{5}{5}
Divide both sides by 5.
a=1
Divide 5 by 5 to get 1.
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