X*4-21=-3

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


Simplifying
X * 4 + -21 = -3

Reorder the terms for easier multiplication:
4X + -21 = -3

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

Solving
-21 + 4X = -3

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + 21 + 4X = -3 + 21

Combine like terms: -21 + 21 = 0
0 + 4X = -3 + 21
4X = -3 + 21

Combine like terms: -3 + 21 = 18
4X = 18

Divide each side by '4'.
X = 4.5

Simplifying
X = 4.5

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