3(-7)+a=9

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Solution for 3(-7)+a=9 equation:


Simplifying
3(-7) + a = 9

Multiply 3 * -7
-21 + a = 9

Solving
-21 + a = 9

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + a = 9 + 21

Combine like terms: -21 + 21 = 0
0 + a = 9 + 21
a = 9 + 21

Combine like terms: 9 + 21 = 30
a = 30

Simplifying
a = 30

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