Question

-x-1,4=0,4x -0,6+1,6a=0,4a -3x+7,5=-0,5x

Answer 1

-х-1,4=0,4
-х-0,4=1,4
-1,4=1,4
х=-1

Answer 2

А) -1,4х-1,4=0; Х=-1
Б) -0,6+1,2а=0; -0,6=-1,2а; а=1/2
В) -2,5х+7,5=0; Х=3

Answer 3

To solve each of the equations, we need to isolate the variable (x or a) on one side of the equal sign. Let's go through them step by step:

1. -x - 1 = 0 To solve for x, add 1 to both sides and then multiply both sides by -1 to get rid of the negative sign in front of x.

   -x - 1 + 1 = 0 + 1 -x = 1

   Now, multiply both sides by -1:

   -1 * (-x) = -1 * 1 x = -1

   So, the solution for x is x = -1.

2. 4x - 0.6 + 1.6a = 0.4a To solve for a, let's first move all the terms with 'a' to one side and all the terms with 'x' to the other side.

   4x - 0.6 + 1.6a - 0.4a = 0

   Now, combine the 'a' terms:

   4x + (1.6a - 0.4a) - 0.6 = 0

   Simplify:

   4x + 1.2a - 0.6 = 0

   Next, move the '4x' term to the other side:

   4x + 1.2a = 0.6

   Now, isolate 'a' by dividing both sides by 1.2:

   1.2a = 0.6

   a = 0.6 / 1.2

   a = 0.5

   So, the solution for a is a = 0.5.

3. -3x + 7.5 = -0.5x To solve for x, let's move all the terms with 'x' to one side and the constant term to the other side.

   -3x + 0.5x = 7.5

   Now, combine the 'x' terms:

   -3x + 0.5x = (0.5 - 3)x = -2.5x

   So, we have:

   -2.5x = 7.5

   Now, isolate 'x' by dividing both sides by -2.5:

   x = 7.5 / -2.5

   x = -3

   So, the solution for x is x = -3.

To summarize:

1. x = -1
2. a = 0.5
3. x = -3