-75=-21a

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Solution for -75=-21a equation:


Simplifying
-75 = -21a

Solving
-75 = -21a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '21a' to each side of the equation.
-75 + 21a = -21a + 21a

Combine like terms: -21a + 21a = 0
-75 + 21a = 0

Add '75' to each side of the equation.
-75 + 75 + 21a = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 21a = 0 + 75
21a = 0 + 75

Combine like terms: 0 + 75 = 75
21a = 75

Divide each side by '21'.
a = 3.571428571

Simplifying
a = 3.571428571

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