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