4=2*ab

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Solution for 4=2*ab equation:


Simplifying
4 = 2ab

Solving
4 = 2ab

Solving for variable 'a'.

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

Add '-2ab' to each side of the equation.
4 + -2ab = 2ab + -2ab

Combine like terms: 2ab + -2ab = 0
4 + -2ab = 0

Add '-4' to each side of the equation.
4 + -4 + -2ab = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -2ab = 0 + -4
-2ab = 0 + -4

Combine like terms: 0 + -4 = -4
-2ab = -4

Divide each side by '-2b'.
a = 2b-1

Simplifying
a = 2b-1

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