Each step in a procedure to solve this equation is shown.
Equation: 5x - 7 = 3(x + 1)
Step 1: 5x - 7 = 3x + 3
Step 2: 2x - 7= 3
Step 3: 2x = -4
Step 4: x= -2
In which step is the first error made?
A. from the original equation to step 1
B. from step 1 to step 2
C. from step 2 to step 3
D. from step 3 to step 4