Lisa wrote the expression (3x + 6x) - 2(x + 1) + 5. she simplified the expression using the following steps:
step one: 3(1 + x) - 2(x + 1) + 5
step two: 3(x + 1) - 2(x +1) + 5
step three: (x + 1) + 5
step four: x + 6
lisa says that (3x + 6x) - 2(x + 1) + 5 = x + 6. lisa's statement is incorrect. in which step did lisa first make the mistake, and what is the correct expression for that step? show your work.

Step 1. Should be 3(x +2x) -2(x +1) +5 . . .

or . . . 3x(1 +2) -2(x +1) +5 . . .

or . . . 9x -2(x+1) +5

Step-by-step explanation:

Lisa apparently failed to realize that both terms inside the first set of parentheses have 3x as a factor. They are like terms, so could be combined directly. If Lisa really wants to factor out 3 or 3x, she could do so and then combine the remaining factors at another step.

36 is the final answer! : )