x+15=4x+21

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Solution for x+15=4x+21 equation:


Simplifying
x + 15 = 4x + 21

Reorder the terms:
15 + x = 4x + 21

Reorder the terms:
15 + x = 21 + 4x

Solving
15 + x = 21 + 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.
15 + x + -4x = 21 + 4x + -4x

Combine like terms: x + -4x = -3x
15 + -3x = 21 + 4x + -4x

Combine like terms: 4x + -4x = 0
15 + -3x = 21 + 0
15 + -3x = 21

Add '-15' to each side of the equation.
15 + -15 + -3x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -3x = 21 + -15
-3x = 21 + -15

Combine like terms: 21 + -15 = 6
-3x = 6

Divide each side by '-3'.
x = -2

Simplifying
x = -2

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