6x-90=150%x
6x-90=1,5x
6x-1,5x=90
4,5x=90 /:4,5
x=20
4,5x=90/:4,5
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6x-90=150%x
6x-90=1,5x
6x-1,5x=90
4,5x=90 /:4,5
x=20
6x-90=1,5x
4,5x=90/:4,5
x=20