15x²-45x=0
15x²=45x
x²=45x/15
x²=3x
x.x=3x(simplificas x)
x=3
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15x²-45x=0
15x²=45x
x²=45x/15
x²=3x
x.x=3x(simplificas x)
x=3
saludos!