Solve for a
a = \frac{80}{13} = 6\frac{2}{13} \approx 6.153846154
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9a-90=-4a-10
Use the distributive property to multiply 9 by a-10.
9a-90+4a=-10
Add 4a to both sides.
13a-90=-10
Combine 9a and 4a to get 13a.
13a=-10+90
Add 90 to both sides.
13a=80
Add -10 and 90 to get 80.
a=\frac{80}{13}
Divide both sides by 13.
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