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So, the simplified expression is 6x2+2x+6.

Let’s try another one: (5x3−2x2+x) + (3x3+4x2−2x+7).

A graph showing 3x to the power of 2. It has the 3 labeled as the coefficient, the x as the variable and the power of 2 as the exponent. A black dotted line. A black dotted line.