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.

3a⁹ - 2a⁹ = 1a⁹

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.

6c - 7 > -5 + c
6c > -5 + c + 7
6c - c > -5 + 7
5c > 2
c > \( \frac{2}{5} \)
c > \(\frac{2}{5}\)

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

7x - 1 = 7 - 2x
7x = 7 - 2x + 1
7x + 2x = 7 + 1
9x = 8
x = \( \frac{8}{9} \)
x = \(\frac{8}{9}\)

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

You need to find the value of c so solve the first equation in terms of z:

-9c + z = -2
z = -2 + 9c

then substitute the result (-2 - -9c) into the second equation:

4c - 2(-2 + 9c) = -5
4c + (-2 x -2) + (-2 x 9c) = -5
4c + 4 - 18c = -5
4c - 18c = -5 - 4
-14c = -9
c = \( \frac{-9}{-14} \)
c = \(\frac{9}{14}\)