-1(x+21)=3(x+13)

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Solution for -1(x+21)=3(x+13) equation:


Simplifying
-1(x + 21) = 3(x + 13)

Reorder the terms:
-1(21 + x) = 3(x + 13)
(21 * -1 + x * -1) = 3(x + 13)
(-21 + -1x) = 3(x + 13)

Reorder the terms:
-21 + -1x = 3(13 + x)
-21 + -1x = (13 * 3 + x * 3)
-21 + -1x = (39 + 3x)

Solving
-21 + -1x = 39 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-21 + -1x + -3x = 39 + 3x + -3x

Combine like terms: -1x + -3x = -4x
-21 + -4x = 39 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + -4x = 39 + 0
-21 + -4x = 39

Add '21' to each side of the equation.
-21 + 21 + -4x = 39 + 21

Combine like terms: -21 + 21 = 0
0 + -4x = 39 + 21
-4x = 39 + 21

Combine like terms: 39 + 21 = 60
-4x = 60

Divide each side by '-4'.
x = -15

Simplifying
x = -15

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