7x+21+3x+9=7x-7

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Solution for 7x+21+3x+9=7x-7 equation:


Simplifying
7x + 21 + 3x + 9 = 7x + -7

Reorder the terms:
21 + 9 + 7x + 3x = 7x + -7

Combine like terms: 21 + 9 = 30
30 + 7x + 3x = 7x + -7

Combine like terms: 7x + 3x = 10x
30 + 10x = 7x + -7

Reorder the terms:
30 + 10x = -7 + 7x

Solving
30 + 10x = -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.
30 + 10x + -7x = -7 + 7x + -7x

Combine like terms: 10x + -7x = 3x
30 + 3x = -7 + 7x + -7x

Combine like terms: 7x + -7x = 0
30 + 3x = -7 + 0
30 + 3x = -7

Add '-30' to each side of the equation.
30 + -30 + 3x = -7 + -30

Combine like terms: 30 + -30 = 0
0 + 3x = -7 + -30
3x = -7 + -30

Combine like terms: -7 + -30 = -37
3x = -37

Divide each side by '3'.
x = -12.33333333

Simplifying
x = -12.33333333

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