4x-21=2x-15

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Solution for 4x-21=2x-15 equation:


Simplifying
4x + -21 = 2x + -15

Reorder the terms:
-21 + 4x = 2x + -15

Reorder the terms:
-21 + 4x = -15 + 2x

Solving
-21 + 4x = -15 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-21 + 4x + -2x = -15 + 2x + -2x

Combine like terms: 4x + -2x = 2x
-21 + 2x = -15 + 2x + -2x

Combine like terms: 2x + -2x = 0
-21 + 2x = -15 + 0
-21 + 2x = -15

Add '21' to each side of the equation.
-21 + 21 + 2x = -15 + 21

Combine like terms: -21 + 21 = 0
0 + 2x = -15 + 21
2x = -15 + 21

Combine like terms: -15 + 21 = 6
2x = 6

Divide each side by '2'.
x = 3

Simplifying
x = 3

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