Question

120:2-х=39 5×х=15×4розв'яжи рівняння

Answer 1

120:2-х=39
60-х=39
-х=39-60
-х=-21
х=21

5×х=15×4
5х=60
х=60:5
х=12

Answer 2

To solve the equations, we need to find the value of the variable "x."

1. First equation: 120 - 2x = 39

Let's solve for x: Step 1: Move the constant term to the other side of the equation by subtracting 39 from both sides. 120 - 2x - 39 = 39 - 39 81 - 2x = 0

Step 2: Now, isolate the variable term by getting rid of the constant term (81) on the left side. We can do this by subtracting 81 from both sides. 81 - 81 - 2x = 0 - 81 -2x = -81

Step 3: Finally, solve for x by dividing both sides by -2. x = -81 / -2 x = 40.5

So the solution to the first equation is x = 40.5.

2. Second equation: 5x = 15 * 4

Let's solve for x: Step 1: Perform the operation on the right side of the equation. 5x = 60

Step 2: Isolate the variable term (5x) by dividing both sides by 5. 5x / 5 = 60 / 5 x = 12

So the solution to the second equation is x = 12.

In summary: The first equation, 120 - 2x = 39, has a solution of x = 40.5. The second equation, 5x = 15 * 4, has a solution of x = 12.