Question

13⋅(7a−7)−7⋅(13a+7)=−140.

Answer 1

Перемножаем получается
91а-91-91а-49=-140
-140=-140
Ответ утверждение верно

Answer 2

Let's simplify the equation step by step:

13(7a - 7) - 7(13a + 7) = -140

Start by applying the distributive property:

91a - 91 - 91a - 49 = -140

Combine like terms:

(91a - 91a) + (-91 - 49) = -140

0a - 140 = -140

0 - 140 = -140

-140 = -140

The equation is true for all values of "a." Therefore, the solution is any real number.