Решение уравнений

a) 4x - 3x = 5x + 500

x = 5x + 500

x - 5x = 500

-4x = 500

$$x = \frac{500}{-4}$$ $$x = -125$$

Ответ: x = -125

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в) 5(x+5) - 3x - 2 = 43

5x + 25 - 3x - 2 = 43

2x + 23 = 43

2x = 43 - 23

2x = 20

$$x = \frac{20}{2}$$ $$x = 10$$

Ответ: x = 10

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г) -7(x-1) + 2(x + 2) = 21.

-7x + 7 + 2x + 4 = 21

-5x + 11 = 21

-5x = 21 - 11

-5x = 10

$$x = \frac{10}{-5}$$ $$x = -2$$

Ответ: x = -2