2x+(a+x)=78

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Solution for 2x+(a+x)=78 equation: 


Simplifying
2x + (a + x) = 78

Remove parenthesis around (a + x)
2x + a + x = 78

Reorder the terms:
a + 2x + x = 78

Combine like terms: 2x + x = 3x
a + 3x = 78

Solving
a + 3x = 78

Solving for variable 'a'.

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

Add '-3x' to each side of the equation.
a + 3x + -3x = 78 + -3x

Combine like terms: 3x + -3x = 0
a + 0 = 78 + -3x
a = 78 + -3x

Simplifying
a = 78 + -3x

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