9x - 3(12 - 7x) = 5(6x - 7) - 9x - 36 + 21x = 30x - 35 - 30x - 36 = 30x - 3Уравнение верно для любого значения x.
3x + 5(x + 5) = (1 - x) + 3x + 5x + 25 = 1 - x + 8x + 25 = 8x = -2x = -2.5
-x - 2 + 3(x - 3) = 3(4 - x) - -x - 2 + 3x - 9 = 12 - 3x - 2x - 11 = 9 - 32x + 3x = 9 + 15x = 2x = 4
9x - 3(12 - 7x) = 5(6x - 7) -
9x - 36 + 21x = 30x - 35 -
30x - 36 = 30x - 3
Уравнение верно для любого значения x.
3x + 5(x + 5) = (1 - x) +
3x + 5x + 25 = 1 - x +
8x + 25 =
8x = -2
x = -2.5
-x - 2 + 3(x - 3) = 3(4 - x) -
-x - 2 + 3x - 9 = 12 - 3x -
2x - 11 = 9 - 3
2x + 3x = 9 + 1
5x = 2
x = 4