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3x - 6 = 15x + 18
-24 = 12x
-2 = x
(X×3)-6=( X×15)+18
3X-6=15X+18
3X-15X=18+6
-12X=24
X=24/-12
X= -2
Comprobación
(X×3)-6=( X×15)+18
(-2×3)-6=(-2×15)+18
-6-6=-30+18
-12=-12
R= -2