6x+18=7x-21

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


Simplifying
6x + 18 = 7x + -21

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

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

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

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

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

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

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

Combine like terms: -21 + -18 = -39
-1x = -39

Divide each side by '-1'.
x = 39

Simplifying
x = 39

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