3x+[5x+4(x-1)]=7x+21

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Solution for 3x+[5x+4(x-1)]=7x+21 equation:


Simplifying
3x + [5x + 4(x + -1)] = 7x + 21

Reorder the terms:
3x + [5x + 4(-1 + x)] = 7x + 21
3x + [5x + (-1 * 4 + x * 4)] = 7x + 21
3x + [5x + (-4 + 4x)] = 7x + 21

Reorder the terms:
3x + [-4 + 5x + 4x] = 7x + 21

Combine like terms: 5x + 4x = 9x
3x + [-4 + 9x] = 7x + 21

Remove brackets around [-4 + 9x]
3x + -4 + 9x = 7x + 21

Reorder the terms:
-4 + 3x + 9x = 7x + 21

Combine like terms: 3x + 9x = 12x
-4 + 12x = 7x + 21

Reorder the terms:
-4 + 12x = 21 + 7x

Solving
-4 + 12x = 21 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
-4 + 12x + -7x = 21 + 7x + -7x

Combine like terms: 12x + -7x = 5x
-4 + 5x = 21 + 7x + -7x

Combine like terms: 7x + -7x = 0
-4 + 5x = 21 + 0
-4 + 5x = 21

Add '4' to each side of the equation.
-4 + 4 + 5x = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5x = 21 + 4
5x = 21 + 4

Combine like terms: 21 + 4 = 25
5x = 25

Divide each side by '5'.
x = 5

Simplifying
x = 5

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