Answer:

Step-by-step explanation:
7y⁴ = 7y²(z - 3ax)
Divide both sides by 7y².
y² = z - 3ax
Add 3ax to both sides. Subtract y² from both sides.
3ax = z - y²
Divide both sides by 3a.

Answer:
B
Step-by-step explanation:
sames sides same angle
180=90+2x
180-90=2x
90=2x
x=45
Answer:
x = -3 and x = -7
Step-by-step explanation:
7 + 2(x+5) = 11
7 + 2x + 10 = 11
2x + 17 = 11
2x = -6
x = -3
7 + -2(x+5) = 11
7 + (-2x) + (-10) = 11
-3 -2x = 11
-2x = 14
x = -7