1+2a=-3a+21

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Solution for 1+2a=-3a+21 equation:


Simplifying
1 + 2a = -3a + 21

Reorder the terms:
1 + 2a = 21 + -3a

Solving
1 + 2a = 21 + -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.
1 + 2a + 3a = 21 + -3a + 3a

Combine like terms: 2a + 3a = 5a
1 + 5a = 21 + -3a + 3a

Combine like terms: -3a + 3a = 0
1 + 5a = 21 + 0
1 + 5a = 21

Add '-1' to each side of the equation.
1 + -1 + 5a = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 5a = 21 + -1
5a = 21 + -1

Combine like terms: 21 + -1 = 20
5a = 20

Divide each side by '5'.
a = 4

Simplifying
a = 4

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