x+21=4(x-15)

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Solution for x+21=4(x-15) equation:


Simplifying
x + 21 = 4(x + -15)

Reorder the terms:
21 + x = 4(x + -15)

Reorder the terms:
21 + x = 4(-15 + x)
21 + x = (-15 * 4 + x * 4)
21 + x = (-60 + 4x)

Solving
21 + x = -60 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
21 + x + -4x = -60 + 4x + -4x

Combine like terms: x + -4x = -3x
21 + -3x = -60 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + -3x = -60 + 0
21 + -3x = -60

Add '-21' to each side of the equation.
21 + -21 + -3x = -60 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = -60 + -21
-3x = -60 + -21

Combine like terms: -60 + -21 = -81
-3x = -81

Divide each side by '-3'.
x = 27

Simplifying
x = 27

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