Here are the steps to solve the equation 6(2x - 11) + 15 = 21:
Step 1: Simplify the expression inside the parentheses by distributing the 6:
6(2x - 11) + 15 = 21
12x - 66 + 15 = 21
Now, we have simplified the left-hand side of the equation.
Step 2: Combine like terms on the left-hand side of the equation:
12x - 66 + 15 = 21
12x - 51 = 21
Now, the left-hand side of the equation is simplified further.
Step 3: Add 51 to both sides of the equation to isolate the variable term:
12x - 51 = 21
12x = 72
Now, we have isolated the variable term on the left-hand side of the equation.
Step 4: Divide both sides of the equation by 12 to solve for x:
12x = 72
x = 6
Now, we have solved for x.
Therefore, the solution to the equation is x = 6.