15-4x=-21

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Solution for 15-4x=-21 equation: 


Simplifying
15 + -4x = -21

Solving
15 + -4x = -21

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -4x = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -4x = -21 + -15
-4x = -21 + -15

Combine like terms: -21 + -15 = -36
-4x = -36

Divide each side by '-4'.
x = 9

Simplifying
x = 9

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