9=-3+n+2n
Need help sovling this equation and checking the answer

N=4

Step-by-step explanation:

First, combine like terms: 12=3n

        The like terms are 9, -3 and n, 2n which add up to 12=3n

(you add 3 to -3 so it cancels out, then add 3 to the other side of the equation: 9, to get 12)

Second, simply by dividing both sides by 3: 4=N

        When you divide 3n by 3 you are left with n, and 12 divided by 3 is 4

cut 138 centimeters off

step-by-step explanation:

250-112 = 138