-[9x+(7x+15)]=11-(21x+9)

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Solution for -[9x+(7x+15)]=11-(21x+9) equation:


Simplifying
-1[9x + (7x + 15)] = 11 + -1(21x + 9)

Reorder the terms:
-1[9x + (15 + 7x)] = 11 + -1(21x + 9)

Remove parenthesis around (15 + 7x)
-1[9x + 15 + 7x] = 11 + -1(21x + 9)

Reorder the terms:
-1[15 + 9x + 7x] = 11 + -1(21x + 9)

Combine like terms: 9x + 7x = 16x
-1[15 + 16x] = 11 + -1(21x + 9)
[15 * -1 + 16x * -1] = 11 + -1(21x + 9)
[-15 + -16x] = 11 + -1(21x + 9)

Reorder the terms:
-15 + -16x = 11 + -1(9 + 21x)
-15 + -16x = 11 + (9 * -1 + 21x * -1)
-15 + -16x = 11 + (-9 + -21x)

Combine like terms: 11 + -9 = 2
-15 + -16x = 2 + -21x

Solving
-15 + -16x = 2 + -21x

Solving for variable 'x'.

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

Add '21x' to each side of the equation.
-15 + -16x + 21x = 2 + -21x + 21x

Combine like terms: -16x + 21x = 5x
-15 + 5x = 2 + -21x + 21x

Combine like terms: -21x + 21x = 0
-15 + 5x = 2 + 0
-15 + 5x = 2

Add '15' to each side of the equation.
-15 + 15 + 5x = 2 + 15

Combine like terms: -15 + 15 = 0
0 + 5x = 2 + 15
5x = 2 + 15

Combine like terms: 2 + 15 = 17
5x = 17

Divide each side by '5'.
x = 3.4

Simplifying
x = 3.4

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