5х+7х-34=56

To solve this equation, first combine like terms on the left side of the equation:

5x + 7x - 34 = 56 12x - 34 = 56

Next, add 34 to both sides of the equation to isolate the variable term:

12x - 34 + 34 = 56 + 34 12x = 90

Finally, divide by 12 on both sides to solve for x:

12x/12 = 90/12 x = 7.5

Therefore, the solution to the equation is x = 7.5.