а)3(x+5)=90
3x+15=90
3x=90-15
3x=75
х=75/3
х=25
б) 2(x-6)=-34
2x-12=-34
2x=-34+12
2x=-22
х=-22/2
х=-11
а)3(x+5)=90
3x+15=90
3x=90-15
3x=75
х=75/3
х=25
б) 2(x-6)=-34
2x-12=-34
2x=-34+12
2x=-22
х=-22/2
х=-11