Ответ:
12х²-3х+20х-5=12х²+42х-6х-21
-3х+20х-5=12х²+42х-6х-21
17х-5=36х-21
17х-36х=-21+5
-19х=-16
х=16/19
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Ответ:
12х²-3х+20х-5=12х²+42х-6х-21
-3х+20х-5=12х²+42х-6х-21
17х-5=36х-21
17х-5=36х-21
17х-36х=-21+5
-19х=-16
х=16/19