3X-21=4X-36

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Solution for 3X-21=4X-36 equation:


Simplifying
3X + -21 = 4X + -36

Reorder the terms:
-21 + 3X = 4X + -36

Reorder the terms:
-21 + 3X = -36 + 4X

Solving
-21 + 3X = -36 + 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 + 3X + -4X = -36 + 4X + -4X

Combine like terms: 3X + -4X = -1X
-21 + -1X = -36 + 4X + -4X

Combine like terms: 4X + -4X = 0
-21 + -1X = -36 + 0
-21 + -1X = -36

Add '21' to each side of the equation.
-21 + 21 + -1X = -36 + 21

Combine like terms: -21 + 21 = 0
0 + -1X = -36 + 21
-1X = -36 + 21

Combine like terms: -36 + 21 = -15
-1X = -15

Divide each side by '-1'.
X = 15

Simplifying
X = 15

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