Write an inequality that represents "nine less than three times a number is greater than forty"?

Three times a number is 3n.  Nine less than that is 3n-9.  This is NOT the same thing: 9-3n.  Subtraction is not commutative.  If n was 1, for example, 3(1)-9=-6.  Looking at the other expression, 9-3(1)=6.  6 and -6 are definitely not the same number.  So be careful how you set up your expression.  Our inequality then would be

Step-by-step explanation:

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation: