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.
