Respuesta :

SDCInfinity

Answer:

x = 7

Step-by-step explanation:

Start with your given equation.

21x - 13x = 56

Add like terms (your x's in this case).

8x = 56

Divide 8 on both sides of the equation and solve.

x = 7

Answer:

x=7

Step-by-step explanation:

21-13=8

8x=56

56/8 = 7