Решите уравнения:
a)
9x+28=2755
510+14x=762
б)
5y-97=943
410-7y=151
в)
3(x+7)=75
14(12-x)=70

5 гарантия )

9х+28=27559х=2755-289х=2727х=2727:9х=303510+14х=76214х=762-51014х=252х=252:14х=185у-97=9435у=943+975у=1040у=1040:5у=208410-7у=151-7у=151-410-7у=-259у=-259:(-7)у=373(х+7)=753х+21=753х=75-213х=54х=54:3х=1814(12-х)=70168-14х=7014х=70-16814х=-98х=-98:14х=-7