7(z+3)-(-3z-7)=9z

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Solution for 7(z+3)-(-3z-7)=9z equation:


Simplifying
7(z + 3) + -1(-3z + -7) = 9z

Reorder the terms:
7(3 + z) + -1(-3z + -7) = 9z
(3 * 7 + z * 7) + -1(-3z + -7) = 9z
(21 + 7z) + -1(-3z + -7) = 9z

Reorder the terms:
21 + 7z + -1(-7 + -3z) = 9z
21 + 7z + (-7 * -1 + -3z * -1) = 9z
21 + 7z + (7 + 3z) = 9z

Reorder the terms:
21 + 7 + 7z + 3z = 9z

Combine like terms: 21 + 7 = 28
28 + 7z + 3z = 9z

Combine like terms: 7z + 3z = 10z
28 + 10z = 9z

Solving
28 + 10z = 9z

Solving for variable 'z'.

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

Add '-9z' to each side of the equation.
28 + 10z + -9z = 9z + -9z

Combine like terms: 10z + -9z = 1z
28 + 1z = 9z + -9z

Combine like terms: 9z + -9z = 0
28 + 1z = 0

Add '-28' to each side of the equation.
28 + -28 + 1z = 0 + -28

Combine like terms: 28 + -28 = 0
0 + 1z = 0 + -28
1z = 0 + -28

Combine like terms: 0 + -28 = -28
1z = -28

Divide each side by '1'.
z = -28

Simplifying
z = -28

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