Ответ:
3a+1=0 и 3а-1=0
3а= -1 3а=1
а= -1/3 a=1/3
x+4=0 и 7х+9=0
х= - 4 7х=9
×=9/7
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Ответ:
3a+1=0 и 3а-1=0
3а= -1 3а=1
а= -1/3 a=1/3
x+4=0 и 7х+9=0
х= - 4 7х=9
×=9/7