Question

3m-4=5 , m+18=20 , 7x=-21 , 2(x+4) =18 , 5k-4=3k+4 , 5(2y+1) =3(y-3)​

Answer 1

Answer:

1.

3m-4=5

=>3m=5+4=9

=>m=9÷3=3

2.

m+18=20

=>m=20-18

=>m=2

3.

7x=-21

=> x= (-21)/7

=>x=-3

4.

2(x+4)=18

or, x-4= 18/2=9

or, x=9+4

or, x=13

5.

5k-4=3k+16

or, 5k-3k=16+4

or, 2k= 20

or, k= 20/2

or, k=10

6.

5(2y+1)=3(y-3)

10y+5=3y-9

10y-3y= -9-5

7y= -14

y= -2