a+d=57

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Solution for a+d=57 equation: 


Simplifying
a + d = 57

Solving
a + d = 57

Solving for variable 'a'.

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

Add '-1d' to each side of the equation.
a + d + -1d = 57 + -1d

Combine like terms: d + -1d = 0
a + 0 = 57 + -1d
a = 57 + -1d

Simplifying
a = 57 + -1d

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