Explicación paso a paso:
12x-9=4(5x-8)
12x-9=20x-32
12x-20x= -32 +9
-8x= -23
x= 23/8
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Explicación paso a paso:
12x-9=4(5x-8)
12x-9=20x-32
12x-20x= -32 +9
-8x= -23
x= 23/8