10 = r + 3
Subtract 3 from each side: 7 = r
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3+10-r+6r = -3+9r+0 13+5r = -3+9r 16 = 4r r = 4
12 = r/3 + 16
13r+10=5r-46 r= r = -7
so 26 = 4r so r = 6½
You subtract 11 from both sides and r equals negative 7. See... r+11=3 -11 -11 r=7