21=-2(7x+4)-(1-4x)

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Solution for 21=-2(7x+4)-(1-4x) equation:


Simplifying
21 = -2(7x + 4) + -1(1 + -4x)

Reorder the terms:
21 = -2(4 + 7x) + -1(1 + -4x)
21 = (4 * -2 + 7x * -2) + -1(1 + -4x)
21 = (-8 + -14x) + -1(1 + -4x)
21 = -8 + -14x + (1 * -1 + -4x * -1)
21 = -8 + -14x + (-1 + 4x)

Reorder the terms:
21 = -8 + -1 + -14x + 4x

Combine like terms: -8 + -1 = -9
21 = -9 + -14x + 4x

Combine like terms: -14x + 4x = -10x
21 = -9 + -10x

Solving
21 = -9 + -10x

Solving for variable 'x'.

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

Add '10x' to each side of the equation.
21 + 10x = -9 + -10x + 10x

Combine like terms: -10x + 10x = 0
21 + 10x = -9 + 0
21 + 10x = -9

Add '-21' to each side of the equation.
21 + -21 + 10x = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 10x = -9 + -21
10x = -9 + -21

Combine like terms: -9 + -21 = -30
10x = -30

Divide each side by '10'.
x = -3

Simplifying
x = -3

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