15-3(x+4)=21

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Solution for 15-3(x+4)=21 equation:


Simplifying
15 + -3(x + 4) = 21

Reorder the terms:
15 + -3(4 + x) = 21
15 + (4 * -3 + x * -3) = 21
15 + (-12 + -3x) = 21

Combine like terms: 15 + -12 = 3
3 + -3x = 21

Solving
3 + -3x = 21

Solving for variable 'x'.

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

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

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

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

Divide each side by '-3'.
x = -6

Simplifying
x = -6

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