2x+21=7x-7

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Solution for 2x+21=7x-7 equation:


Simplifying
2x + 21 = 7x + -7

Reorder the terms:
21 + 2x = 7x + -7

Reorder the terms:
21 + 2x = -7 + 7x

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

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

Combine like terms: 7x + -7x = 0
21 + -5x = -7 + 0
21 + -5x = -7

Add '-21' to each side of the equation.
21 + -21 + -5x = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -5x = -7 + -21
-5x = -7 + -21

Combine like terms: -7 + -21 = -28
-5x = -28

Divide each side by '-5'.
x = 5.6

Simplifying
x = 5.6

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