A school plans to spend twice the amount it did last year on its winter dance, less the cost of the disco ball which was $150, since they have it from last year. A total of $1,500 is being spent this year. Fill in the blanks to write an equation that will determine the amount of last year’s budget, a .

Let x be the amount the school spent last year on the winter dance.

The school plans to spend 2x - $150 = $1500 this year.
Adding $150 to both sides, we get 2x = $1650
Dividing both sides by 2, we get x = $<<825=825>>825.
Therefore, the amount the school spent last year on the winter dance is $<<825=825>>825.
The equation is a = 825. Answer: \boxed{825}.

the answer is

2(a-150)=1500