Ответ:
Пошаговое объяснение:
3*(x + 9) = 21*1 + 7*(x + 1)
3x + 27 = 21 + 7x + 7
3x + 27 = 7x + 28
7x - 3x = 27 - 28
4x = -1
x = -1 : 4
x = -0,25
==============
2*(3x + 4) + 5*(x - 7) = 2*2*(2x + 3)
6x + 8 + 5x - 35 = 8x + 12
11x - 27 = 8x + 12
11x - 8x = 12 + 27
3x = 39
x = 39 : 3
x = 13
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Ответ:
Пошаговое объяснение:
3*(x + 9) = 21*1 + 7*(x + 1)
3x + 27 = 21 + 7x + 7
3x + 27 = 7x + 28
7x - 3x = 27 - 28
4x = -1
x = -1 : 4
x = -0,25
==============
2*(3x + 4) + 5*(x - 7) = 2*2*(2x + 3)
6x + 8 + 5x - 35 = 8x + 12
11x - 27 = 8x + 12
11x - 8x = 12 + 27
3x = 39
x = 39 : 3
x = 13