реши уравнения 3(х+7) =75. 14(12-х) =70 (82+у):6=17 (у-33):9=305

3(х+7) =753x+21=753x=54x=1814(12-х) =70168-14x=70-14x=-98x=7(82+у):6=17 82+y=102y=20(у-33):9=305y-33=2745y=2712

3(х+7) =75;3х+21=75;3х=75-21;3х=54;Х=16.14(12-х) =70;168-14х=70;14х=-98;Х=7.(82+у):6=17;12+у/6=17;У/6=5;У=30.(у-33):9=305;У-33=305×9;у-33=2745;У=2778.