-3a+7=-2a-5

Sure, let's solve the equation step by step:

-3a + 7 = -2a - 5

First, let's get all the terms with 'a' on one side of the equation and the constants on the other side. We can do this by adding 2a to both sides and adding 5 to both sides:

-3a + 2a = -5 - 7

This simplifies to:

-a = -12

Finally, to solve for 'a', we can multiply both sides of the equation by -1:

a = 12

So, the solution to the equation -3a + 7 = -2a - 5 is a = 12.