Question

3(х+5)+7х при х=4

12(4+ у) -5у при у =2

Answer 1

3х+15+7х=0
10х+15=0
10*4+15=55

48+12у-5у=0
48+7у=0
48+7*2=62

Answer 2

1)3x+15+7x=0
10x+15=0
10*4+15=55
2)48+12y-5y=0
48+7y=0
48+7*2=62