Ecuaciones otra vez?

• 5x + 7 - 11x + 3 = x - 25

5x - 11x - x = - 25 - 7 - 3 - 7x = - 35

x = - 35 / - 7

x = 5

Comprobación

5(5) + 7 - 11(5) + 3 = 5 - 25

25 + 7 - 55 + 3 = - 20 - 20 = - 20

• - 7x + 1 + 3x - 12 = 7 + 2x - 7x + 3x - 2x = 7 - 1 + 12 - 6x = 18

x = 18 / - 6

x = - 3

Comprobación - 7( - 3) + 1 + 3( - 3) - 12 = 7 + 2( - 3)

21 + 1 - 9 - 12 = 7 - 6

1 = 1

• - 8 - 5x + 3 + 8x = 1 - x + 10 - 5x + 8x + x = 1 + 10 + 8 - 3

4x = 16

x = 16 / 4

x = 4

Comprobación - 8 - 5(4) + 3 + 8(4) = 1 - 4 + 10 - 8 - 20 + 3 + 32 = 7

7 = 7.