-(x-8)-(7x-5)=21

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Solution for -(x-8)-(7x-5)=21 equation:


Simplifying
-1(x + -8) + -1(7x + -5) = 21

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

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

Reorder the terms:
8 + 5 + -1x + -7x = 21

Combine like terms: 8 + 5 = 13
13 + -1x + -7x = 21

Combine like terms: -1x + -7x = -8x
13 + -8x = 21

Solving
13 + -8x = 21

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + -8x = 21 + -13

Combine like terms: 13 + -13 = 0
0 + -8x = 21 + -13
-8x = 21 + -13

Combine like terms: 21 + -13 = 8
-8x = 8

Divide each side by '-8'.
x = -1

Simplifying
x = -1

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