Question

5х-21=4 или 5х-21=-4

Answer 1

5x-21=4
5x=4+21
5x=25|:5
x=5

5x-21=-4
5x=-4+21
5x=17
x=17/5

Answer 2

To solve the equations 5x - 21 = 4 and 5x - 21 = -4, we can use basic algebraic principles. Let's solve them one by one:

1. 5x - 21 = 4: To isolate the variable term (5x), we can add 21 to both sides of the equation: 5x - 21 + 21 = 4 + 21 This simplifies to: 5x = 25 Next, to solve for x, we divide both sides of the equation by 5: 5x/5 = 25/5 This gives us the solution: x = 5

2. 5x - 21 = -4: Similarly, we'll add 21 to both sides of the equation to isolate the variable term: 5x - 21 + 21 = -4 + 21 This simplifies to: 5x = 17 Dividing both sides of the equation by 5 gives us: 5x/5 = 17/5 The solution is: x = 17/5 or x = 3.4

So, the solutions to the equations are x = 5 and x = 3.4 (or 17/5).