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

-7c - y = -2c - 5y + 4
-7c = -2c - 5y + 4 + y
-7c + 2c = -5y + 4 + y
-5c = -4y + 4
c = \( \frac{-4y + 4}{-5} \)
c = \( \frac{-4y}{-5} \) + \( \frac{4}{-5} \)
c = \(\frac{4}{5}\)y - \(\frac{4}{5}\)

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.

6a⁶ - 9a⁶ = -3a⁶

An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:

d° = b° + c°

To find angle c, remember that the sum of the interior angles of a triangle is 180°:

180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 60° - 53° = 67°

So, d° = 53° + 67° = 120°

A shortcut to get this answer is to remember that angles around a line add up to 180°:

a° + d° = 180°
d° = 180° - a°
d° = 180° - 60° = 120°

The formula for area is πr²:

a = πr²
a = π(5²)
a = 25π

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.