Oh honey, "3r 12" doesn't quite make sense. I think you might have mixed up your math lingo there. If you're looking to solve an equation involving "3r" and "12," we need a bit more information to get to the bottom of it. Just remember, math is like a recipe - you gotta have all the right ingredients to make it work.
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7r = 3r - 527r (- 3r) = 3r - 52 (- 3r)4r = - 524r / 4 = -52 / 4r = -13
What you want to do is to try and get all the variables on one side by adding/subtracting. Then get the numbers on the other side and solve.
17 = 13 - 3r Subtract 13 from bith sides: 4 = -3r Divide both sides by -3 : -4/3 = r or r = -1.3...
3r + 3r + 2t = 6r + 2t
(3r - 2)(3r - 2) or (3r - 2) squared.