This is the answer:
step 1: distribute
your equation should look like this: 6x+9-4x=-3
step 2: combine like terms
your equation should look like this: 2x+9=-3
step 3: subtract both sides by 9
your equation should look like this: 2x=-12
step 4: divide both sides by 2 (don't divide both sides by 2x)
your answer and equations should be: x=-6