x = 21
To solve the equation, follow these steps.
3(x-7) = 42
Distribute the three into the parenthesis:
3x - 21 = 42
Isolate the variable, x, by first doing the inverse operation: add 21 to both sides to cancel it out
3x = 63
Now to isolate the variable entirely, divide both sides by 3 as divide is the inverse of multiply.
x = 21
To check this, input 21 as x in the equation:
3 (21-7) = 42
Subtract 21 and 7:
3 (14) = 42
42 = 42
Hope this helps!
