t-r=u

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Solution for t-r=u equation: 


Simplifying
t + -1r = u

Reorder the terms:
-1r + t = u

Solving
-1r + t = u

Solving for variable 'r'.

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

Add '-1t' to each side of the equation.
-1r + t + -1t = -1t + u

Combine like terms: t + -1t = 0
-1r + 0 = -1t + u
-1r = -1t + u

Divide each side by '-1'.
r = t + -1u

Simplifying
r = t + -1u

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