ab+cd=20

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Solution for ab+cd=20 equation: 


Simplifying
ab + cd = 20

Solving
ab + cd = 20

Solving for variable 'a'.

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

Add '-1cd' to each side of the equation.
ab + cd + -1cd = 20 + -1cd

Combine like terms: cd + -1cd = 0
ab + 0 = 20 + -1cd
ab = 20 + -1cd

Divide each side by 'b'.
a = 20b-1 + -1b-1cd

Simplifying
a = 20b-1 + -1b-1cd

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