Question

Решите уравнения
а)2(y+3)=21-3y
б)(2-c)+3 (c-3)=-13
в)-3 (1-3b)-12=12

Answer 1

1)2(y+3)=21-3y

    2y+6=21-3y

    2y+3y=21-6

    5y=15

    y=3 

2)2-c+3c-9=-13
-c+3c=-13-2+9
2c=-6
c=-3 
 3)-3+9b-12=12
9b=12+12+3
9b=27
b=27/9
b=3 

Answer 2

2)2-c+3c-9=-13
-c+3c=-13-2+9
2c=-6
c=-3

Answer 3

3)-3+9b-12=12
9b=12+12+3
9b=27
b=27/9
b=3