10a-20=r

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Solution for 10a-20=r equation: 


Simplifying
10a + -20 = r

Reorder the terms:
-20 + 10a = r

Solving
-20 + 10a = r

Solving for variable 'a'.

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

Add '20' to each side of the equation.
-20 + 20 + 10a = 20 + r

Combine like terms: -20 + 20 = 0
0 + 10a = 20 + r
10a = 20 + r

Divide each side by '10'.
a = 2 + 0.1r

Simplifying
a = 2 + 0.1r

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