3x-21+4x=15-2x

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Solution for 3x-21+4x=15-2x equation:


Simplifying
3x + -21 + 4x = 15 + -2x

Reorder the terms:
-21 + 3x + 4x = 15 + -2x

Combine like terms: 3x + 4x = 7x
-21 + 7x = 15 + -2x

Solving
-21 + 7x = 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 + 7x + 2x = 15 + -2x + 2x

Combine like terms: 7x + 2x = 9x
-21 + 9x = 15 + -2x + 2x

Combine like terms: -2x + 2x = 0
-21 + 9x = 15 + 0
-21 + 9x = 15

Add '21' to each side of the equation.
-21 + 21 + 9x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9x = 15 + 21
9x = 15 + 21

Combine like terms: 15 + 21 = 36
9x = 36

Divide each side by '9'.
x = 4

Simplifying
x = 4

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