7x-21=3x+15

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Solution for 7x-21=3x+15 equation:


Simplifying
7x + -21 = 3x + 15

Reorder the terms:
-21 + 7x = 3x + 15

Reorder the terms:
-21 + 7x = 15 + 3x

Solving
-21 + 7x = 15 + 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 + 7x + -3x = 15 + 3x + -3x

Combine like terms: 7x + -3x = 4x
-21 + 4x = 15 + 3x + -3x

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

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

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

Combine like terms: 15 + 21 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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