Answer:
see below
Explanation:
9a+5(3-a)=11 given
Distribute the 5 using the distributive property
9a +15 -5a = 11
Combine like terms, using simplification
4a +15 =11
Subtract 15 from each side, using the subtraction property of equality
4a+15-15 = 11-15
4a = -4
Divide each side by 4 using the division property of equality
4a/4 = -4/4
a = -1 by simplifying