а) 10х-5=8х+1
10х-8х=1+5
2х=6
х=3
б) (х-4)(х+4)=7
х²+4х-4х-16=7
х²-16=7
х²=7+16
х²=23
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а) 10х-5=8х+1
10х-8х=1+5
2х=6
х=3
б) (х-4)(х+4)=7
х²+4х-4х-16=7
х²-16=7
х²=7+16
х²=23