-10(3-4x) + 51 = 7(5x+3)
-30 + 40x + 51 = 35x + 21
40x + 21 = 35x + 21
40x - 35x = 21 - 21
5x = 0
x = 0
Проверка:
-10(3-40) + 51 = 7(5*0+3)
-10(3) + 51 = 7*3
-30 + 51 = 21
21 = 21
Ответ: x = 0.
-10(3-4x) + 51 = 7(5x+3)
-30 + 40x + 51 = 35x + 21
40x + 21 = 35x + 21
40x - 35x = 21 - 21
5x = 0
x = 0
Проверка:
-10(3-40) + 51 = 7(5*0+3)
-10(3) + 51 = 7*3
-30 + 51 = 21
21 = 21
Ответ: x = 0.