First, subtract 4z from each side to get 18 = z - 2. Then add 2 to each side to get 20 = z. We can also add 2 to each side before subtracting 4z from each side. Pick your poison.
Example 3
Solve the equation 0.05x + 0.03 = 1 - 0.02.
Answer
Simplify the right-hand side to get 0.05x + 0.03 = 0.98. Subtract 0.03 from each side to get 0.05x = 0.05. Divide each side by 0.05 to get x = 19.
Example 4
Solve the equation .
Answer
Add to each side to get Then multiply each side by 4 to get y = 16.
Example 5
Solve the equation 6z - 11z + 2 = 3 - 10 + z.
Answer
First, simplify to get -5z + 2 = -7 + z. Then add 5z to each side to get 2 = -7 + 6z. Add 7 to each side to get 9 = 6z. Finally, divide each side by 6 to get
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to each side to get 
Then multiply each side by 4 to get y = 16.