A+a+b+b=45

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Solution for A+a+b+b=45 equation: 


Simplifying
A + a + b + b = 45

Combine like terms: b + b = 2b
A + a + 2b = 45

Solving
A + a + 2b = 45

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.
A + a + -1a + 2b = 45 + -1a

Combine like terms: a + -1a = 0
A + 0 + 2b = 45 + -1a
A + 2b = 45 + -1a

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

Combine like terms: 2b + -2b = 0
A + 0 = 45 + -1a + -2b
A = 45 + -1a + -2b

Simplifying
A = 45 + -1a + -2b

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