Question

12x - 3x + 90 = 12x + 57
X = ?

What is x ?

Answer 1

Answer:

x = 11

Step-by-step explanation:

12x - 3x + 90 = 12x + 57

simplify both sides

12x - 3x + 90 = 12x + 57

9x + 90 = 12x + 57

inverse operations

9x + 90 = 12x + 57

-9x            -9x

90 = 3x + 57

-57         -57

33 = 3x

/3     /3

11 = x

Answer 2

Answer:

x = 11

General Formulas and Concepts:

Order of Operations: BPEMDAS

Step-by-step explanation:

Step 1: Write equation

12x - 3x + 90 = 12x + 57

Step 2: Solve for x

1. Combine like terms:                         9x + 90 = 12x + 57
2. Subtract 9 on both sides:                 90 = 3x + 57
3. Subtract 57 on both sides:               33 = 3x
4. Divide 3 on both sides:                     11 = x
5. Rewrite:                                              x = 11

Step 3: Check

Plug in x to verify it's a solution.

1. Substitute:                         12(11) - 3(11) + 90 = 12(11) + 57
2. Multiply:                             132 - 33 + 90 = 132 + 57
3. Subtract:                            99 + 90 = 132 + 57
4. Add:                                    189 = 189