a-42+a=a+45

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Solution for a-42+a=a+45 equation:


Simplifying
a + -42 + a = a + 45

Reorder the terms:
-42 + a + a = a + 45

Combine like terms: a + a = 2a
-42 + 2a = a + 45

Reorder the terms:
-42 + 2a = 45 + a

Solving
-42 + 2a = 45 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-42 + 2a + -1a = 45 + a + -1a

Combine like terms: 2a + -1a = 1a
-42 + 1a = 45 + a + -1a

Combine like terms: a + -1a = 0
-42 + 1a = 45 + 0
-42 + 1a = 45

Add '42' to each side of the equation.
-42 + 42 + 1a = 45 + 42

Combine like terms: -42 + 42 = 0
0 + 1a = 45 + 42
1a = 45 + 42

Combine like terms: 45 + 42 = 87
1a = 87

Divide each side by '1'.
a = 87

Simplifying
a = 87

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