15+3a=-18

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Solution for 15+3a=-18 equation: 


Simplifying
15 + 3a = -18

Solving
15 + 3a = -18

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + 3a = -18 + -15

Combine like terms: 15 + -15 = 0
0 + 3a = -18 + -15
3a = -18 + -15

Combine like terms: -18 + -15 = -33
3a = -33

Divide each side by '3'.
a = -11

Simplifying
a = -11

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