2a-21=5(a+21)

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Solution for 2a-21=5(a+21) equation:


Simplifying
2a + -21 = 5(a + 21)

Reorder the terms:
-21 + 2a = 5(a + 21)

Reorder the terms:
-21 + 2a = 5(21 + a)
-21 + 2a = (21 * 5 + a * 5)
-21 + 2a = (105 + 5a)

Solving
-21 + 2a = 105 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
-21 + 2a + -5a = 105 + 5a + -5a

Combine like terms: 2a + -5a = -3a
-21 + -3a = 105 + 5a + -5a

Combine like terms: 5a + -5a = 0
-21 + -3a = 105 + 0
-21 + -3a = 105

Add '21' to each side of the equation.
-21 + 21 + -3a = 105 + 21

Combine like terms: -21 + 21 = 0
0 + -3a = 105 + 21
-3a = 105 + 21

Combine like terms: 105 + 21 = 126
-3a = 126

Divide each side by '-3'.
a = -42

Simplifying
a = -42

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