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9+2r=5r

We move all terms to the left:

9+2r-(5r)=0

We add all the numbers together, and all the variables

-3r+9=0

We move all terms containing r to the left, all other terms to the right

-3r=-9

r=-9/-3

r=+3

| -15x+9=-15-9 | | 3n^2+3n-1000=0 | | 4e+3=3e+8 | | y=2.8+3 | | 10-10*10=x-10 | | 10-10*10=x | | 9y-7,8+1y=5,6y | | 10*10+10=x | | 3x/4=2x/27 | | 6x-3x/2=18 | | x-116=5x | | 10=3x/5+3=4x | | v=63000-47500 | | 9.5=x7.8+x | | 5^x=5^0 | | 3/18=x/6 | | 17=12+x3 | | t?4=36. | | t?4=36 | | 48000=70000-t | | g^2=100 | | 4+18k=17+19k | | ?(x)=2x2+3x+5 | | x=4(5)=30 | | (90x-0.5x^2)-(50x+15000)=15000 | | (x-2)(5x+2)=180 | | 3+(3)/(2)x+4=4x-(5)/(2)x | | 3(2u+8)=30 | | (90x-0.5x^2)-(50x+300)=15000 | | Q=400-2x | | (90x-0.5x^2)-(50x+300)=1500 | | 0=6s^2-6s+7 |

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