Question

4) What could be the first step taken to solve the equation 2x + 5 = 4x - 7?

A. Subtract 7 from both sides of the equation
B. Subtract 2x from both sides of the equation
C. Divide both sides of the equation by 5
D. Rewrite 2x + 4x as 6x​

Answer 1

B. Subtract 2x from both sides of the equation.

Explanation:
We have to combine like terms, so we subtract 2x from both sides since we are doing the opposite of addition which is subtraction. Then, add 7 to both sides. After that we can divide. And get the answer.
Why A isn't the answer:
We can't subtract 7 from both sides since the 7 in the equation is already negative so we have to do the opposite which is adding.