Answer
$3x^3+2x^2+33$
Work Step by Step
Like terms are terms whose variables (and their exponents such as the $5$ in $53*x^5$) are the same. In other words, terms that are "like" each other.
Thus,
$(3x^2-x^2)+(40-7)+3x^3 = 3x^3+2x^2+33$
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