21=-7(2x-1)

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Solution for 21=-7(2x-1) equation:


Simplifying
21 = -7(2x + -1)

Reorder the terms:
21 = -7(-1 + 2x)
21 = (-1 * -7 + 2x * -7)
21 = (7 + -14x)

Solving
21 = 7 + -14x

Solving for variable 'x'.

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

Add '14x' to each side of the equation.
21 + 14x = 7 + -14x + 14x

Combine like terms: -14x + 14x = 0
21 + 14x = 7 + 0
21 + 14x = 7

Add '-21' to each side of the equation.
21 + -21 + 14x = 7 + -21

Combine like terms: 21 + -21 = 0
0 + 14x = 7 + -21
14x = 7 + -21

Combine like terms: 7 + -21 = -14
14x = -14

Divide each side by '14'.
x = -1

Simplifying
x = -1

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