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4x-12=3x+6
4x-3x = 12+6
x = 18
(2^4)^(x-3)=(2^3)(x+2) aplicamos ley de los exponentes
2^4(x-3)=2^3(x+2) aplicamos esta propiedad, si a^f(x)=a^g(x) entonces f(x)=g(x)
entonces
4(x-3)=3(x+2)
4x-12=3x+6
4x-3x=6+12
x=18