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- 15x + 12 + 6x - 18 = 3x - 21x + 1 + 2
- 9x - 6 = - 18x + 3
- 9x + 18x = 3 + 6
9x = 9
x = 9/9
x = 1
Solución :
x = 1
-9x-6=3x-18
18-6=3x+9x
12=12x
1=x
Espero haberte ayudado:)