3(r+2s)=2t−4
Use the distributive property to multiply 3 by r+2s.
3r+6s=2t−4
Subtract 6s from both sides.
3r=2t−4−6s
The equation is in standard form.
3r=−6s+2t−4
Divide both sides by 3.
3
3r
=
3
−6s+2t−4
Dividing by 3 undoes the multiplication by 3.
r=
3
−6s+2t−4
Divide −4+2t−6s by 3.
r=
3
2t
−2s−
3
4
SOLVE FOR S