A+2B=7

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Solution for A+2B=7 equation: 


Simplifying
A + 2B = 7

Solving
A + 2B = 7

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 = 7 + -2B

Combine like terms: 2B + -2B = 0
A + 0 = 7 + -2B
A = 7 + -2B

Simplifying
A = 7 + -2B

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