105-3X=4X-21

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Solution for 105-3X=4X-21 equation:


Simplifying
105 + -3X = 4X + -21

Reorder the terms:
105 + -3X = -21 + 4X

Solving
105 + -3X = -21 + 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.
105 + -3X + -4X = -21 + 4X + -4X

Combine like terms: -3X + -4X = -7X
105 + -7X = -21 + 4X + -4X

Combine like terms: 4X + -4X = 0
105 + -7X = -21 + 0
105 + -7X = -21

Add '-105' to each side of the equation.
105 + -105 + -7X = -21 + -105

Combine like terms: 105 + -105 = 0
0 + -7X = -21 + -105
-7X = -21 + -105

Combine like terms: -21 + -105 = -126
-7X = -126

Divide each side by '-7'.
X = 18

Simplifying
X = 18

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