7s + 4(3-5) = 18
Multiply the bracket by 4
(4)(3)=12
(4)(-5)=-20
7s+12-20=18
7s-8=18
Move -8 to the other side.
Sign changes from -8 to +8
7s-8+8=18+8
7s=18=8
7s=26
Divide both sides by 7
7s/7=26/7
Answer: s=26/7 or s=3 5/7
Answer:
7s+4(3-5)=18
7s=18-12+20
s=3.714
