3x-12 =2x+3
2
(3×-12)×2 =2x×2+3×2
3x-12=2x×2+3×2
3x-12=4x+3×2
3x-12=4x+6
3x-4x=6+12
-x=6+12
-x=18
x=-18
Respuesta: -18
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3x-12 =2x+3
2
(3×-12)×2 =2x×2+3×2
2
3x-12=2x×2+3×2
3x-12=4x+3×2
3x-12=4x+6
3x-4x=6+12
-x=6+12
-x=18
x=-18
Respuesta: -18