the answer is x = -13

First off distribute your positive 3 and positive 5. So. 12+3x+10-5x=48. Combine like terms! 12+10=22 and 3x-5x= -2x 22-2x=48 Subtract 22 from each side. -2x=26. Now divide each side by -2 1x=13 Plug it in to make sure it is correct!