Simplify the expression
(6++i)

4+5i.

Step 1: Remove the, unnecessary, parentheses.

(6+6i)-(2+i)

=6+6i-2-i

(the signs of the numbers in the second parentheses change because of the minus sign in front of it)

Step 2: Collect Like Terms.

=6-2+6i-i

Step 3: Subtract.

=4+5i.

(6+6i)-(2+i) = 4+5i.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9