(5 + x)(4 - x) - (4 + x)(3 - x) - 2 -х
20-5х+4х-х²-(12-4х+3х-х²)-2-х
20-5х+4х-х²-(12-х-х²)-2-х
10-5х+4х-х²-12+х+х²-2-х
[tex]6 - x[/tex]
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(5 + x)(4 - x) - (4 + x)(3 - x) - 2 -х
20-5х+4х-х²-(12-4х+3х-х²)-2-х
20-5х+4х-х²-(12-х-х²)-2-х
10-5х+4х-х²-12+х+х²-2-х
[tex]6 - x[/tex]