x-[4x-7]=5x-[x+21]

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Solution for x-[4x-7]=5x-[x+21] equation:


Simplifying
x + -1[4x + -7] = 5x + -1[x + 21]

Reorder the terms:
x + -1[-7 + 4x] = 5x + -1[x + 21]
x + [-7 * -1 + 4x * -1] = 5x + -1[x + 21]
x + [7 + -4x] = 5x + -1[x + 21]

Reorder the terms:
7 + x + -4x = 5x + -1[x + 21]

Combine like terms: x + -4x = -3x
7 + -3x = 5x + -1[x + 21]

Reorder the terms:
7 + -3x = 5x + -1[21 + x]
7 + -3x = 5x + [21 * -1 + x * -1]
7 + -3x = 5x + [-21 + -1x]

Reorder the terms:
7 + -3x = -21 + 5x + -1x

Combine like terms: 5x + -1x = 4x
7 + -3x = -21 + 4x

Solving
7 + -3x = -21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
7 + -3x + -4x = -21 + 4x + -4x

Combine like terms: -3x + -4x = -7x
7 + -7x = -21 + 4x + -4x

Combine like terms: 4x + -4x = 0
7 + -7x = -21 + 0
7 + -7x = -21

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

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

Combine like terms: -21 + -7 = -28
-7x = -28

Divide each side by '-7'.
x = 4

Simplifying
x = 4

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