Question

1)-7(2-3х)=56 2)(5+7а)*15=30

Answer 1

Ответ:

Ответ во вложении.....

Answer 2

To solve these equations, let's work on them one by one:

1. -7(2-3x) = 56

First, simplify the expression inside the parentheses: -7 * (2 - 3x) = 56 -7 * 2 + 7 * (-3x) = 56 -14 - 21x = 56

Next, let's isolate the variable by moving constants to the other side: -21x = 56 + 14 -21x = 70

Now, divide both sides by -21 to solve for x: x = 70 / -21 x ≈ -3.33

Therefore, the solution to the equation is x ≈ -3.33.

2. (5 + 7a) * 15 = 30

First, distribute the 15 to both terms inside the parentheses: 15 * 5 + 15 * 7a = 30 75 + 105a = 30

Next, move the constant term to the other side: 105a = 30 - 75 105a = -45

Now, divide both sides by 105 to solve for a: a = -45 / 105 a ≈ -0.43

Therefore, the solution to the equation is a ≈ -0.43.