21x+9=7x-3

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


Simplifying
21x + 9 = 7x + -3

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

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

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

Combine like terms: 21x + -7x = 14x
9 + 14x = -3 + 7x + -7x

Combine like terms: 7x + -7x = 0
9 + 14x = -3 + 0
9 + 14x = -3

Add '-9' to each side of the equation.
9 + -9 + 14x = -3 + -9

Combine like terms: 9 + -9 = 0
0 + 14x = -3 + -9
14x = -3 + -9

Combine like terms: -3 + -9 = -12
14x = -12

Divide each side by '14'.
x = -0.8571428571

Simplifying
x = -0.8571428571

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