Question

1)30 - 2Х=45+Х 2)0,3Х+5,5=0,4+7,5

Answer 1

Ответ:

Пошаговое объяснение:

1)30-2х=45+х

-2х-х=45-30

-3х=15

Х=-5

2)0,3х+5,5=0,4+7,5

0,3х+5,5=7,9

0,3х=7,9-5,5

0,3х=2,4

Х=8

Answer 2

Пошаговое объяснение:

1)-3x=15

X=15:(-3)

X=(-5)

Answer 3

Let's solve each equation step by step:

1. 30 - 2X = 45 + X

To solve this equation, we'll isolate the variable X on one side of the equation.

First, let's simplify the equation by combining like terms:

30 - 2X = 45 + X

Next, let's bring all the terms with X to one side and the constant terms to the other side:

30 - 45 = X + 2X

-15 = 3X

To isolate X, we divide both sides of the equation by 3:

-15/3 = X

X = -5

Therefore, the solution to the equation is X = -5.

2. 0.3X + 5.5 = 0.4 + 7.5

To solve this equation, we'll follow a similar process.

First, let's simplify the equation by combining like terms:

0.3X + 5.5 = 0.4 + 7.5

Next, let's bring all the constant terms to one side and the term with X to the other side:

0.3X - 0.4 = 7.5 - 5.5

0.3X - 0.4 = 2

To eliminate the decimal, we can multiply the entire equation by 10:

10(0.3X - 0.4) = 10(2)

3X - 4 = 20

Next, let's isolate X by moving the constant term to the other side:

3X = 20 + 4

3X = 24

To find X, we divide both sides of the equation by 3:

X = 24/3

X = 8

Therefore, the solution to the equation is X = 8.