-5x-4(x+3)=-21

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Solution for -5x-4(x+3)=-21 equation:


Simplifying
-5x + -4(x + 3) = -21

Reorder the terms:
-5x + -4(3 + x) = -21
-5x + (3 * -4 + x * -4) = -21
-5x + (-12 + -4x) = -21

Reorder the terms:
-12 + -5x + -4x = -21

Combine like terms: -5x + -4x = -9x
-12 + -9x = -21

Solving
-12 + -9x = -21

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + -9x = -21 + 12

Combine like terms: -12 + 12 = 0
0 + -9x = -21 + 12
-9x = -21 + 12

Combine like terms: -21 + 12 = -9
-9x = -9

Divide each side by '-9'.
x = 1

Simplifying
x = 1

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