Shau-uen solve the equation 18.5w+6.5w-2.8w=149.1 her work is shown below

step(1)
18.5w+6.5w-2.8w= 149.1^0
step(2)
25w-2.8w= 149.1
step(3)
-2.8w=5.964
step(4)
w= -2.13
in which step did shaun make her first error?

a. step 1
b. step 2
c. step 3
d. step 4

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