Question

СРОЧНО!!!!!!
1. |1-3х|=21.
2. 7=|3-4х|
3. |2-7х|<2
4. 9<|1-х|​

Answer 1

1+3x=21
3x=20
x=6.(6)

3+4x=7
4x=4
x=1

2+7x<2
7x<0
x<0

1+x>9
x>8