Solve for a
a=2
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10a-20+5a=10
Add 5a to both sides.
15a-20=10
Combine 10a and 5a to get 15a.
15a=10+20
Add 20 to both sides.
15a=30
Add 10 and 20 to get 30.
a=\frac{30}{15}
Divide both sides by 15.
a=2
Divide 30 by 15 to get 2.
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