84-21a=-63

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Solution for 84-21a=-63 equation: 


Simplifying
84 + -21a = -63

Solving
84 + -21a = -63

Solving for variable 'a'.

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

Add '-84' to each side of the equation.
84 + -84 + -21a = -63 + -84

Combine like terms: 84 + -84 = 0
0 + -21a = -63 + -84
-21a = -63 + -84

Combine like terms: -63 + -84 = -147
-21a = -147

Divide each side by '-21'.
a = 7

Simplifying
a = 7

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