9+15-3+x=3x+4x-21

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Solution for 9+15-3+x=3x+4x-21 equation:


Simplifying
9 + 15 + -3 + x = 3x + 4x + -21

Combine like terms: 9 + 15 = 24
24 + -3 + x = 3x + 4x + -21

Combine like terms: 24 + -3 = 21
21 + x = 3x + 4x + -21

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

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

Solving
21 + x = -21 + 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 + x + -7x = -21 + 7x + -7x

Combine like terms: x + -7x = -6x
21 + -6x = -21 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -6x = -21 + 0
21 + -6x = -21

Add '-21' to each side of the equation.
21 + -21 + -6x = -21 + -21

Combine like terms: 21 + -21 = 0
0 + -6x = -21 + -21
-6x = -21 + -21

Combine like terms: -21 + -21 = -42
-6x = -42

Divide each side by '-6'.
x = 7

Simplifying
x = 7

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