6x+9=7x+21

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Solution for 6x+9=7x+21 equation:


Simplifying
6x + 9 = 7x + 21

Reorder the terms:
9 + 6x = 7x + 21

Reorder the terms:
9 + 6x = 21 + 7x

Solving
9 + 6x = 21 + 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 + 6x + -7x = 21 + 7x + -7x

Combine like terms: 6x + -7x = -1x
9 + -1x = 21 + 7x + -7x

Combine like terms: 7x + -7x = 0
9 + -1x = 21 + 0
9 + -1x = 21

Add '-9' to each side of the equation.
9 + -9 + -1x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 21 + -9
-1x = 21 + -9

Combine like terms: 21 + -9 = 12
-1x = 12

Divide each side by '-1'.
x = -12

Simplifying
x = -12

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