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Factor the expression $3x(x+1) + 7(x+1)$.
3x(x+1) + 7(x+1)
Since both of the values in the parenthesis are equal, we can combine.
Notice the parenthesis. If i had just done 3x+7(x+1), then only 7 would be multiplied by x+1.
So (3x+7)(x+1) is your final answer.