75=90-z

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Solution for 75=90-z equation:


Simplifying
75 = 90 + -1z

Solving
75 = 90 + -1z

Solving for variable 'z'.

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

Add 'z' to each side of the equation.
75 + z = 90 + -1z + z

Combine like terms: -1z + z = 0
75 + z = 90 + 0
75 + z = 90

Add '-75' to each side of the equation.
75 + -75 + z = 90 + -75

Combine like terms: 75 + -75 = 0
0 + z = 90 + -75
z = 90 + -75

Combine like terms: 90 + -75 = 15
z = 15

Simplifying
z = 15

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