A+(12+2A)=90

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Solution for A+(12+2A)=90 equation:


Simplifying
A + (12 + 2A) = 90

Remove parenthesis around (12 + 2A)
A + 12 + 2A = 90

Reorder the terms:
12 + A + 2A = 90

Combine like terms: A + 2A = 3A
12 + 3A = 90

Solving
12 + 3A = 90

Solving for variable 'A'.

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

Add '-12' to each side of the equation.
12 + -12 + 3A = 90 + -12

Combine like terms: 12 + -12 = 0
0 + 3A = 90 + -12
3A = 90 + -12

Combine like terms: 90 + -12 = 78
3A = 78

Divide each side by '3'.
A = 26

Simplifying
A = 26

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