-x+28+3x=9x-21

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Solution for -x+28+3x=9x-21 equation:


Simplifying
-1x + 28 + 3x = 9x + -21

Reorder the terms:
28 + -1x + 3x = 9x + -21

Combine like terms: -1x + 3x = 2x
28 + 2x = 9x + -21

Reorder the terms:
28 + 2x = -21 + 9x

Solving
28 + 2x = -21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
28 + 2x + -9x = -21 + 9x + -9x

Combine like terms: 2x + -9x = -7x
28 + -7x = -21 + 9x + -9x

Combine like terms: 9x + -9x = 0
28 + -7x = -21 + 0
28 + -7x = -21

Add '-28' to each side of the equation.
28 + -28 + -7x = -21 + -28

Combine like terms: 28 + -28 = 0
0 + -7x = -21 + -28
-7x = -21 + -28

Combine like terms: -21 + -28 = -49
-7x = -49

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

Simplifying
x = 7

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