5X-7X+21=2X-21

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Solution for 5X-7X+21=2X-21 equation: 


Simplifying
5X + -7X + 21 = 2X + -21

Reorder the terms:
21 + 5X + -7X = 2X + -21

Combine like terms: 5X + -7X = -2X
21 + -2X = 2X + -21

Reorder the terms:
21 + -2X = -21 + 2X

Solving
21 + -2X = -21 + 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 + -2X + -2X = -21 + 2X + -2X

Combine like terms: -2X + -2X = -4X
21 + -4X = -21 + 2X + -2X

Combine like terms: 2X + -2X = 0
21 + -4X = -21 + 0
21 + -4X = -21

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

Combine like terms: 21 + -21 = 0
0 + -4X = -21 + -21
-4X = -21 + -21

Combine like terms: -21 + -21 = -42
-4X = -42

Divide each side by '-4'.
X = 10.5

Simplifying
X = 10.5

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