-7x+9=-3x+21

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


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

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

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

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

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
9 + -7x + 3x = 21 + -3x + 3x

Combine like terms: -7x + 3x = -4x
9 + -4x = 21 + -3x + 3x

Combine like terms: -3x + 3x = 0
9 + -4x = 21 + 0
9 + -4x = 21

Add '-9' to each side of the equation.
9 + -9 + -4x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -4x = 21 + -9
-4x = 21 + -9

Combine like terms: 21 + -9 = 12
-4x = 12

Divide each side by '-4'.
x = -3

Simplifying
x = -3

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