(3+4)+z=(4+8)

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Solution for (3+4)+z=(4+8) equation: 


Simplifying
(3 + 4) + z = (4 + 8)

Combine like terms: 3 + 4 = 7
(7) + z = (4 + 8)
7 + z = (4 + 8)

Combine like terms: 4 + 8 = 12
7 + z = (12)
7 + z = 12

Solving
7 + z = 12

Solving for variable 'z'.

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

Add '-7' to each side of the equation.
7 + -7 + z = 12 + -7

Combine like terms: 7 + -7 = 0
0 + z = 12 + -7
z = 12 + -7

Combine like terms: 12 + -7 = 5
z = 5

Simplifying
z = 5

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