6x-21=7x-18

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Solution for 6x-21=7x-18 equation:


Simplifying
6x + -21 = 7x + -18

Reorder the terms:
-21 + 6x = 7x + -18

Reorder the terms:
-21 + 6x = -18 + 7x

Solving
-21 + 6x = -18 + 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 + 6x + -7x = -18 + 7x + -7x

Combine like terms: 6x + -7x = -1x
-21 + -1x = -18 + 7x + -7x

Combine like terms: 7x + -7x = 0
-21 + -1x = -18 + 0
-21 + -1x = -18

Add '21' to each side of the equation.
-21 + 21 + -1x = -18 + 21

Combine like terms: -21 + 21 = 0
0 + -1x = -18 + 21
-1x = -18 + 21

Combine like terms: -18 + 21 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

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