-21=-7(3+6a)

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Solution for -21=-7(3+6a) equation:


Simplifying
-21 = -7(3 + 6a)
-21 = (3 * -7 + 6a * -7)
-21 = (-21 + -42a)

Add '21' to each side of the equation.
-21 + 21 = -21 + 21 + -42a

Combine like terms: -21 + 21 = 0
0 = -21 + 21 + -42a

Combine like terms: -21 + 21 = 0
0 = 0 + -42a
0 = -42a

Solving
0 = -42a

Solving for variable 'a'.

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

Add '42a' to each side of the equation.
0 + 42a = -42a + 42a
Remove the zero:
42a = -42a + 42a

Combine like terms: -42a + 42a = 0
42a = 0

Divide each side by '42'.
a = 0

Simplifying
a = 0

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