-r+s+t=u

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Solution for -r+s+t=u equation:


Simplifying
-1r + s + t = u

Solving
-1r + s + t = u

Solving for variable 'r'.

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

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

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

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

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

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

Simplifying
r = s + t + -1u

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