To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.

-4a - 6x = -9a - x + 2
-4a = -9a - x + 2 + 6x
-4a + 9a = -x + 2 + 6x
5a = 5x + 2
a = \( \frac{5x + 2}{5} \)
a = \( \frac{5x}{5} \) + \( \frac{2}{5} \)
a = x + \(\frac{2}{5}\)

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

8a + 8a = 16a

The area of a rectangle is equal to its length x width:

a = l x w
a = a x b
a = 5 x 7
a = 35

To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.

The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 9 x 9) + (2 x 9 x 5) + (2 x 9 x 5)
sa = (162) + (90) + (90)
sa = 342