3x+21=7x-15

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


Simplifying
3x + 21 = 7x + -15

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

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

Solving
21 + 3x = -15 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + 3x + -7x = -15 + 7x + -7x

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

Combine like terms: 7x + -7x = 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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