18)
75 = -5(-3 - 4x)
Distributive property
75 = 15 + 20x
Subtract 15 from both sides
60 = 20x
x = 60/20
x = 3
Answer is the first one x = 3
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19)
-4y + 8 = 4(2y - 2) - 2(-16 + 8y)
Distributive property
-4y + 8 = 8y - 8 + 32 - 16y
Combine like terms
-4y + 8 = -8y + 24
Add 8y to both sides
4y + 8 = 24
Subtract 8 from both sides
4y = 16
Divide both sides by 4
y = 4
Answer is the second one
y = 4