-[7z-(9z+2)]=2+(1z+7)

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Solution for -[7z-(9z+2)]=2+(1z+7) equation:


Simplifying
-1[7z + -1(9z + 2)] = 2 + (1z + 7)

Reorder the terms:
-1[7z + -1(2 + 9z)] = 2 + (1z + 7)
-1[7z + (2 * -1 + 9z * -1)] = 2 + (1z + 7)
-1[7z + (-2 + -9z)] = 2 + (1z + 7)

Reorder the terms:
-1[-2 + 7z + -9z] = 2 + (1z + 7)

Combine like terms: 7z + -9z = -2z
-1[-2 + -2z] = 2 + (1z + 7)
[-2 * -1 + -2z * -1] = 2 + (1z + 7)
[2 + 2z] = 2 + (1z + 7)

Reorder the terms:
2 + 2z = 2 + (7 + 1z)

Remove parenthesis around (7 + 1z)
2 + 2z = 2 + 7 + 1z

Combine like terms: 2 + 7 = 9
2 + 2z = 9 + 1z

Solving
2 + 2z = 9 + 1z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
2 + 2z + -1z = 9 + 1z + -1z

Combine like terms: 2z + -1z = 1z
2 + 1z = 9 + 1z + -1z

Combine like terms: 1z + -1z = 0
2 + 1z = 9 + 0
2 + 1z = 9

Add '-2' to each side of the equation.
2 + -2 + 1z = 9 + -2

Combine like terms: 2 + -2 = 0
0 + 1z = 9 + -2
1z = 9 + -2

Combine like terms: 9 + -2 = 7
1z = 7

Divide each side by '1'.
z = 7

Simplifying
z = 7

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