1x-21=4x-18

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Solution for 1x-21=4x-18 equation:


Simplifying
1x + -21 = 4x + -18

Reorder the terms:
-21 + 1x = 4x + -18

Reorder the terms:
-21 + 1x = -18 + 4x

Solving
-21 + 1x = -18 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + 1x + -4x = -18 + 4x + -4x

Combine like terms: 1x + -4x = -3x
-21 + -3x = -18 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -3x = -18 + 0
-21 + -3x = -18

Add '21' to each side of the equation.
-21 + 21 + -3x = -18 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = -18 + 21
-3x = -18 + 21

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

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

Simplifying
x = -1

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