18.9=a+a+(a-3)

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Solution for 18.9=a+a+(a-3) equation:


Simplifying
18.9 = a + a + (a + -3)

Reorder the terms:
18.9 = a + a + (-3 + a)

Remove parenthesis around (-3 + a)
18.9 = a + a + -3 + a

Reorder the terms:
18.9 = -3 + a + a + a

Combine like terms: a + a = 2a
18.9 = -3 + 2a + a

Combine like terms: 2a + a = 3a
18.9 = -3 + 3a

Solving
18.9 = -3 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
18.9 + -3a = -3 + 3a + -3a

Combine like terms: 3a + -3a = 0
18.9 + -3a = -3 + 0
18.9 + -3a = -3

Add '-18.9' to each side of the equation.
18.9 + -18.9 + -3a = -3 + -18.9

Combine like terms: 18.9 + -18.9 = 0.0
0.0 + -3a = -3 + -18.9
-3a = -3 + -18.9

Combine like terms: -3 + -18.9 = -21.9
-3a = -21.9

Divide each side by '-3'.
a = 7.3

Simplifying
a = 7.3

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