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-3x+9=-11+2x
-3x-2x=-11-9
-5x=-11-9
-5x=-20
x=-20/-5
x=4
- 3x + 9 = 2x - 11
- 3x - 2x = - 11 - 9
- 5x = - 20
x = -20/-5
x = 4
Solución :
x = 4
COMPROBAMOS :
- 3x + 9 = - 3 + 2x - 8
- 3 (4) + 9 = - 3 + 2 (4) - 8
- 12 + 9 = - 3 + 8 - 8
- 3 = - 11 + 8
- 3 = - 3
La solución es correcta.