20-7a=3a-20

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


Simplifying
20 + -7a = 3a + -20

Reorder the terms:
20 + -7a = -20 + 3a

Solving
20 + -7a = -20 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
20 + -7a + -3a = -20 + 3a + -3a

Combine like terms: -7a + -3a = -10a
20 + -10a = -20 + 3a + -3a

Combine like terms: 3a + -3a = 0
20 + -10a = -20 + 0
20 + -10a = -20

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

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

Combine like terms: -20 + -20 = -40
-10a = -40

Divide each side by '-10'.
a = 4

Simplifying
a = 4

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