Помогите плиз!!!!!!!!!!!!

Question

Помогите плиз!!!!!!!!!!!!

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Answer 1

А)х-4х=-9-12
-3х=-21
Х=7
Б)6х-4=7-1+3х
6х-3х=7-1+4
3х=9
х=3

Answer 2

1) если х=-2. то
х²- 6=х <=>4-6=-2

х+12=4х+9
12=3х+9
3=3х
х=1


2(3х-2)=7-(1-3х)
6х-4=7-1+3х
6х-3х=4+7-1
3х=10
х=3 1/3