6qr+7rs-2st=-9 solve for r
solve for r.6qr+7rs−2st=−9Add 2st to both sides.6qr+7rs−2st+2st=−9+2st6qr+7rs=2st−9Factor out variable r.r(6q+7s)=2st−9Divide both sides by 6q+7s.r(6q+7s) / 6q+7s = 2st−9 / 6q+7sr = 2st−9 / 6q+7s
6qr + 7rs - 2st = -96qr + 7rs = -9 + 2str ( 6q + 7s ) = -9 + 2str = -9 + 2st / 6q + 7s Ans
