Ecuaciones2x + 21 = 3x - 612(x - 2) = 1 - xx + 5x - 4 = 18 - 2x6(7 - x) = 8(6 - x)4(2x + 3) - 2x4x + 204(x - 6) = 12 - (x - 3)3(1 - 2x) + 12 = 10 - 2(x - 3) - 2(x + 3) - 4 = 18 + 4x6x - 2(x - 3) = 12(?

2x + 21 = 3x - 6

21 + 6 = 3x - 2x

27 = x 12(x - 2) = 1 - x

12x - 24 = 1 - x

12x + x = 1 + 24

13x = 25

x = 25 / 13 x + 5x - 4 = 18 - 2x

x + 5x + 2x = 18 + 4

8x = 22

x = 22 / 8 = 11 / 4 6(7 - x) = 8(6 - x)

42 - 6x = 48 - 8x

8x - 6x = 48 - 42

2x = 6

x = 6 / 2 = 3 4(2x + 3) - 2x = 4x + 20

8x + 12 - 2x = 4x + 20

8x - 2x - 4x = 20 - 12

2x = 8

x = 8 / 2 = 4 4(x - 6) = 12 - (x - 3)

4x - 24 = 12 - x - 3

4x + x = 12 - 3 + 24

5x = 33

x = 33 / 5

3(1 - 2x) + 12 = 10 - 2(x - 3)

3 - 6x + 12 = 10 - 2x + 6 - 6x + 2x = 10 + 6 - 12 - 3 - 2x = 1

x = - 1 / 2 - 2(x + 3) - 4 = 18 + 4x - 2x - 6 - 4 = 18 + 4x - 2x - 4x = 18 + 10 - 6x = 28

x = - 28 / 6 = - 14 / 3 6x - 2(x - 3) = 12

6x - 2x + 6 = 12

4x = 12 - 6

4x = 6

x = 6 / 4 = 3 / 2 (x + 3).

3 = (13 - x).

4 + 3

3x + 9 = 52 - 4x + 3

3x + 4x = 52 + 3 - 9

7x = 46

x = 46 / 7.