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Solve for t q=(s+t)(r/2)

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Isolate the factor (s+t): s+t = q / (r/2). This simplifies to s+t=2q/r.
Subtract s from both sides to isolate t:

t=2q/r - s (Answer).

Alternatively, mult. both sides of q=(s+t)(r/2) by 2 to eliminate the fraction r/2:

2q=(s+t)(r) = sr + tr

Subtract sr from both sides: 2q - sr = tr

Divide both sides by r to obtain an equation for t: (2q/sr) - (sr/r) = t,
or (2q/sr) - s = t

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