-2(4x-5)-(x+7)=21

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Solution for -2(4x-5)-(x+7)=21 equation:


Simplifying
-2(4x + -5) + -1(x + 7) = 21

Reorder the terms:
-2(-5 + 4x) + -1(x + 7) = 21
(-5 * -2 + 4x * -2) + -1(x + 7) = 21
(10 + -8x) + -1(x + 7) = 21

Reorder the terms:
10 + -8x + -1(7 + x) = 21
10 + -8x + (7 * -1 + x * -1) = 21
10 + -8x + (-7 + -1x) = 21

Reorder the terms:
10 + -7 + -8x + -1x = 21

Combine like terms: 10 + -7 = 3
3 + -8x + -1x = 21

Combine like terms: -8x + -1x = -9x
3 + -9x = 21

Solving
3 + -9x = 21

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + -9x = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -9x = 21 + -3
-9x = 21 + -3

Combine like terms: 21 + -3 = 18
-9x = 18

Divide each side by '-9'.
x = -2

Simplifying
x = -2

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