simplify step-by-step. 5x+8−4x+7 =5x+8+−4x+7 Combine Like Terms: =5x+8+−4x+7 =(5x+−4x)+(8+7) =x+15

remember, we can move terms around remember, a+b=b+a so group like terms x with x and constant with constant 5x+8-4x+7= 5x-4x+8+7= x(5-4)+8+7= x(1)+8+7= 1x+15= x+15