3a+21=35-4a

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Solution for 3a+21=35-4a equation:


Simplifying
3a + 21 = 35 + -4a

Reorder the terms:
21 + 3a = 35 + -4a

Solving
21 + 3a = 35 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
21 + 3a + 4a = 35 + -4a + 4a

Combine like terms: 3a + 4a = 7a
21 + 7a = 35 + -4a + 4a

Combine like terms: -4a + 4a = 0
21 + 7a = 35 + 0
21 + 7a = 35

Add '-21' to each side of the equation.
21 + -21 + 7a = 35 + -21

Combine like terms: 21 + -21 = 0
0 + 7a = 35 + -21
7a = 35 + -21

Combine like terms: 35 + -21 = 14
7a = 14

Divide each side by '7'.
a = 2

Simplifying
a = 2

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