Advanced 8th grade algebra help?!?

Solve. 50q-43=52q-81 Possible answers- -19, -38, 38, or 19 Solve. -(a-9)=3a+17 Possible answers- -2, 6.5, -4, or -8 Solve the equation and state a reason for each step. 8x-4=5x+8 Solve. 7b+3-4b=3-3(b+4) Thanks!!:D