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а) 3+9х=15-8х
...9х...8х=...15...3
б)12у-4=-27-8у
...12у...8у=...27...4
в)53-10а=30а-8
...53...8=....10а...30а
а) 3+9х=15-8х
...9х...8х=...15...3
б)12у-4=-27-8у
...12у...8у=...27...4
в)53-10а=30а-8
...53...8=....10а...30а
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+9х+8х=+15-3
б)12у-4=-27-8у
+12у+8у=-27+4
в)53-10а=30а-8
+53+8=+10а+30а