x+y+z+u=10

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Solution for x+y+z+u=10 equation: 


Simplifying
x + y + z + u = 10

Reorder the terms:
u + x + y + z = 10

Solving
u + x + y + z = 10

Solving for variable 'u'.

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

Add '-1x' to each side of the equation.
u + x + y + -1x + z = 10 + -1x

Reorder the terms:
u + x + -1x + y + z = 10 + -1x

Combine like terms: x + -1x = 0
u + 0 + y + z = 10 + -1x
u + y + z = 10 + -1x

Add '-1y' to each side of the equation.
u + y + -1y + z = 10 + -1x + -1y

Combine like terms: y + -1y = 0
u + 0 + z = 10 + -1x + -1y
u + z = 10 + -1x + -1y

Add '-1z' to each side of the equation.
u + z + -1z = 10 + -1x + -1y + -1z

Combine like terms: z + -1z = 0
u + 0 = 10 + -1x + -1y + -1z
u = 10 + -1x + -1y + -1z

Simplifying
u = 10 + -1x + -1y + -1z

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