(4a)(b)=28

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Solution for (4a)(b)=28 equation: 


Simplifying
(4a)(b) = 28

Remove parenthesis around (4a)
4a(b) = 28

Multiply a * b
4ab = 28

Solving
4ab = 28

Solving for variable 'a'.

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

Divide each side by '4b'.
a = 7b-1

Simplifying
a = 7b-1

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