-4x-21=3(3x+4)-7

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Solution for -4x-21=3(3x+4)-7 equation:


Simplifying
-4x + -21 = 3(3x + 4) + -7

Reorder the terms:
-21 + -4x = 3(3x + 4) + -7

Reorder the terms:
-21 + -4x = 3(4 + 3x) + -7
-21 + -4x = (4 * 3 + 3x * 3) + -7
-21 + -4x = (12 + 9x) + -7

Reorder the terms:
-21 + -4x = 12 + -7 + 9x

Combine like terms: 12 + -7 = 5
-21 + -4x = 5 + 9x

Solving
-21 + -4x = 5 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
-21 + -4x + -9x = 5 + 9x + -9x

Combine like terms: -4x + -9x = -13x
-21 + -13x = 5 + 9x + -9x

Combine like terms: 9x + -9x = 0
-21 + -13x = 5 + 0
-21 + -13x = 5

Add '21' to each side of the equation.
-21 + 21 + -13x = 5 + 21

Combine like terms: -21 + 21 = 0
0 + -13x = 5 + 21
-13x = 5 + 21

Combine like terms: 5 + 21 = 26
-13x = 26

Divide each side by '-13'.
x = -2

Simplifying
x = -2

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