3(20-a)=7a

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Solution for 3(20-a)=7a equation:


Simplifying
3(20 + -1a) = 7a
(20 * 3 + -1a * 3) = 7a
(60 + -3a) = 7a

Solving
60 + -3a = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
60 + -3a + -7a = 7a + -7a

Combine like terms: -3a + -7a = -10a
60 + -10a = 7a + -7a

Combine like terms: 7a + -7a = 0
60 + -10a = 0

Add '-60' to each side of the equation.
60 + -60 + -10a = 0 + -60

Combine like terms: 60 + -60 = 0
0 + -10a = 0 + -60
-10a = 0 + -60

Combine like terms: 0 + -60 = -60
-10a = -60

Divide each side by '-10'.
a = 6

Simplifying
a = 6

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