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3r + 3r + 2t = 6r + 2t
19-2t = 7 -2t = 7-19 -2t = -12 t = 6
12(t+6)+8=4(2t-1)+2t 12t+72+8=8t-4+2t 12t-2t-8t=-72-8-4 2t=-84 2t/2=84/2 t=42
4t +7
6t -2t + 5u = 4t - 5u