5a-3a=20-b

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Solution for 5a-3a=20-b equation: 


Simplifying
5a + -3a = 20 + -1b

Combine like terms: 5a + -3a = 2a
2a = 20 + -1b

Solving
2a = 20 + -1b

Solving for variable 'a'.

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

Divide each side by '2'.
a = 10 + -0.5b

Simplifying
a = 10 + -0.5b

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