a+b+b=90

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Solution for a+b+b=90 equation: 


Simplifying
a + b + b = 90

Combine like terms: b + b = 2b
a + 2b = 90

Solving
a + 2b = 90

Solving for variable 'a'.

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

Add '-2b' to each side of the equation.
a + 2b + -2b = 90 + -2b

Combine like terms: 2b + -2b = 0
a + 0 = 90 + -2b
a = 90 + -2b

Simplifying
a = 90 + -2b

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