4x 42 + 42 = 40 5 - 20
168x + 42 = 200 - 20
168x + 42 = 180
168x = 180 - 42
168x = 138
x = 138 / 168
x ≈ 0.8214285714
Проверка:
4 0.8214285714 42 + 42 = 40 * 5 - 20
142.8571428 + 42 = 200
184.8571428 = 200
Уравнение верное.
4x 42 + 42 = 40 5 - 20
168x + 42 = 200 - 20
168x + 42 = 180
168x = 180 - 42
168x = 138
x = 138 / 168
x ≈ 0.8214285714
Проверка:
4 0.8214285714 42 + 42 = 40 * 5 - 20
142.8571428 + 42 = 200
184.8571428 = 200
Уравнение верное.