3(x-1)+21=x-6(x+1)

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Solution for 3(x-1)+21=x-6(x+1) equation:


Simplifying
3(x + -1) + 21 = x + -6(x + 1)

Reorder the terms:
3(-1 + x) + 21 = x + -6(x + 1)
(-1 * 3 + x * 3) + 21 = x + -6(x + 1)
(-3 + 3x) + 21 = x + -6(x + 1)

Reorder the terms:
-3 + 21 + 3x = x + -6(x + 1)

Combine like terms: -3 + 21 = 18
18 + 3x = x + -6(x + 1)

Reorder the terms:
18 + 3x = x + -6(1 + x)
18 + 3x = x + (1 * -6 + x * -6)
18 + 3x = x + (-6 + -6x)

Reorder the terms:
18 + 3x = -6 + x + -6x

Combine like terms: x + -6x = -5x
18 + 3x = -6 + -5x

Solving
18 + 3x = -6 + -5x

Solving for variable 'x'.

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

Add '5x' to each side of the equation.
18 + 3x + 5x = -6 + -5x + 5x

Combine like terms: 3x + 5x = 8x
18 + 8x = -6 + -5x + 5x

Combine like terms: -5x + 5x = 0
18 + 8x = -6 + 0
18 + 8x = -6

Add '-18' to each side of the equation.
18 + -18 + 8x = -6 + -18

Combine like terms: 18 + -18 = 0
0 + 8x = -6 + -18
8x = -6 + -18

Combine like terms: -6 + -18 = -24
8x = -24

Divide each side by '8'.
x = -3

Simplifying
x = -3

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