a+20=3a-10

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Solution for a+20=3a-10 equation:


Simplifying
a + 20 = 3a + -10

Reorder the terms:
20 + a = 3a + -10

Reorder the terms:
20 + a = -10 + 3a

Solving
20 + a = -10 + 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 + a + -3a = -10 + 3a + -3a

Combine like terms: a + -3a = -2a
20 + -2a = -10 + 3a + -3a

Combine like terms: 3a + -3a = 0
20 + -2a = -10 + 0
20 + -2a = -10

Add '-20' to each side of the equation.
20 + -20 + -2a = -10 + -20

Combine like terms: 20 + -20 = 0
0 + -2a = -10 + -20
-2a = -10 + -20

Combine like terms: -10 + -20 = -30
-2a = -30

Divide each side by '-2'.
a = 15

Simplifying
a = 15

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