x-2(4x-9)=6x-21

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Solution for x-2(4x-9)=6x-21 equation:


Simplifying
x + -2(4x + -9) = 6x + -21

Reorder the terms:
x + -2(-9 + 4x) = 6x + -21
x + (-9 * -2 + 4x * -2) = 6x + -21
x + (18 + -8x) = 6x + -21

Reorder the terms:
18 + x + -8x = 6x + -21

Combine like terms: x + -8x = -7x
18 + -7x = 6x + -21

Reorder the terms:
18 + -7x = -21 + 6x

Solving
18 + -7x = -21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
18 + -7x + -6x = -21 + 6x + -6x

Combine like terms: -7x + -6x = -13x
18 + -13x = -21 + 6x + -6x

Combine like terms: 6x + -6x = 0
18 + -13x = -21 + 0
18 + -13x = -21

Add '-18' to each side of the equation.
18 + -18 + -13x = -21 + -18

Combine like terms: 18 + -18 = 0
0 + -13x = -21 + -18
-13x = -21 + -18

Combine like terms: -21 + -18 = -39
-13x = -39

Divide each side by '-13'.
x = 3

Simplifying
x = 3

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