4a+7=-21

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Solution for 4a+7=-21 equation: 


Simplifying
4a + 7 = -21

Reorder the terms:
7 + 4a = -21

Solving
7 + 4a = -21

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 4a = -21 + -7

Combine like terms: 7 + -7 = 0
0 + 4a = -21 + -7
4a = -21 + -7

Combine like terms: -21 + -7 = -28
4a = -28

Divide each side by '4'.
a = -7

Simplifying
a = -7

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