` ((8,9),(5,-1))((-2,3),(4,0)) `

`= ((8 xx -2+9xx4,8xx3+9xx0),(5xx-2+ -1xx4,5xx3 + -1xx0))`

` = ((-16+36,24+0),(-10+ -4,15 + 0)) `

` = ((20,24),(-14,15)) `

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