Question

1)3.5(x-2)=7
2)7(x+3)=21
3)21(x-1)=7
4)6(x+4)=12

Answer 1

1.х-2=2
х=2+2
х=4
2.х+3=3
х=0
3.3(х-1)=1
3х-3=1
3х=1+3
3х=4
х=4/3
4.х+4=2
х =2-4
х=-2
вроде так

Answer 2

1) 3,5x-7=7 3,5x=0 x=0. 2) 7x+21=21 7x=0 x=0. 3) 21x-21=7 21x=7+21 21x=28 x=28/21 x=1 7/21. 4) 6x+24=12 6x=12-24 6x=-12 x=-2