2a-21=-7(3+7a)

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Solution for 2a-21=-7(3+7a) equation:


Simplifying
2a + -21 = -7(3 + 7a)

Reorder the terms:
-21 + 2a = -7(3 + 7a)
-21 + 2a = (3 * -7 + 7a * -7)
-21 + 2a = (-21 + -49a)

Add '21' to each side of the equation.
-21 + 21 + 2a = -21 + 21 + -49a

Combine like terms: -21 + 21 = 0
0 + 2a = -21 + 21 + -49a
2a = -21 + 21 + -49a

Combine like terms: -21 + 21 = 0
2a = 0 + -49a
2a = -49a

Solving
2a = -49a

Solving for variable 'a'.

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

Add '49a' to each side of the equation.
2a + 49a = -49a + 49a

Combine like terms: 2a + 49a = 51a
51a = -49a + 49a

Combine like terms: -49a + 49a = 0
51a = 0

Divide each side by '51'.
a = 0

Simplifying
a = 0

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