Rob is asked to simplify the expression below.
10x-2 (4x+6y) + 3y
He states that the simplified expression is 2x+15y because using the Distributive Property yields 10x-8x+12y+3y, and then combining like terms yields 2x+15y.
Explain the error in Rob' s reasoning.
Write the correct simplified expression for 10x-2 (4x+6y) + 3y. Show your work.
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