Пошаговое объяснение:
5x + 8=3(3x-4)-4
5x + 8 = 9x - 12 - 4
5x + 8 = 9x - 16
9x - 5x = 8 + 16
4x = 24
x = 24 : 4
x = 6
12-7x=4(3+2x)-15
12 - 7x = 12 + 8x - 15
12 - 7x = -3 + 8x
8x + 7x = 12 + 3
15x = 15
x = 15 : 15
x = 1
Пошаговое объяснение:
5x + 8=3(3x-4)-4
5x + 8 = 9x - 12 - 4
5x + 8 = 9x - 16
9x - 5x = 8 + 16
4x = 24
x = 24 : 4
x = 6
12-7x=4(3+2x)-15
12 - 7x = 12 + 8x - 15
12 - 7x = -3 + 8x
8x + 7x = 12 + 3
15x = 15
x = 15 : 15
x = 1