18 August, 20:33
Q=3 (r+1) / r
Make r the subject of the formula
18 August, 20:56
Distribute the 3 to the parentheses. Q=3r+3/r
Next multiply both sides by r to get rid of the division sign.
Subtract 3r on both sides and you get Qr-3r=3
Since both numbers have an r in it, we can factor out the r
r (Q-3) = 3
Then we divide Q-3 on both sides
r=3 / (Q-3)
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