21-5x=4(x+3)

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


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

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

Solving
21 + -5x = 12 + 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.
21 + -5x + -4x = 12 + 4x + -4x

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

Combine like terms: 4x + -4x = 0
21 + -9x = 12 + 0
21 + -9x = 12

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

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

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

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

Simplifying
x = 1

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