(r+s)(t+u)=

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Solution for (r+s)(t+u)= equation:


Simplifying
(r + s)(t + u) = 0

Multiply (r + s) * (t + u)
(r(t + u) + s(t + u)) = 0
((t * r + u * r) + s(t + u)) = 0
((rt + ru) + s(t + u)) = 0
(rt + ru + (t * s + u * s)) = 0
(rt + ru + (st + su)) = 0
(rt + ru + st + su) = 0

Solving
rt + ru + st + su = 0

Solving for variable 'r'.

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

Add '-1st' to each side of the equation.
rt + ru + st + -1st + su = 0 + -1st

Combine like terms: st + -1st = 0
rt + ru + 0 + su = 0 + -1st
rt + ru + su = 0 + -1st
Remove the zero:
rt + ru + su = -1st

Add '-1su' to each side of the equation.
rt + ru + su + -1su = -1st + -1su

Combine like terms: su + -1su = 0
rt + ru + 0 = -1st + -1su
rt + ru = -1st + -1su

Reorder the terms:
rt + ru + st + su = -1st + st + -1su + su

Combine like terms: -1st + st = 0
rt + ru + st + su = 0 + -1su + su
rt + ru + st + su = -1su + su

Combine like terms: -1su + su = 0
rt + ru + st + su = 0

The solution to this equation could not be determined.

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