3-6a-21=3a+10-2a

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Solution for 3-6a-21=3a+10-2a equation:


Simplifying
3 + -6a + -21 = 3a + 10 + -2a

Reorder the terms:
3 + -21 + -6a = 3a + 10 + -2a

Combine like terms: 3 + -21 = -18
-18 + -6a = 3a + 10 + -2a

Reorder the terms:
-18 + -6a = 10 + 3a + -2a

Combine like terms: 3a + -2a = 1a
-18 + -6a = 10 + 1a

Solving
-18 + -6a = 10 + 1a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-18 + -6a + -1a = 10 + 1a + -1a

Combine like terms: -6a + -1a = -7a
-18 + -7a = 10 + 1a + -1a

Combine like terms: 1a + -1a = 0
-18 + -7a = 10 + 0
-18 + -7a = 10

Add '18' to each side of the equation.
-18 + 18 + -7a = 10 + 18

Combine like terms: -18 + 18 = 0
0 + -7a = 10 + 18
-7a = 10 + 18

Combine like terms: 10 + 18 = 28
-7a = 28

Divide each side by '-7'.
a = -4

Simplifying
a = -4

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