Verified answer

Ответ:

1)7(х-6)/4=5(х+1)/3-3(х+2)

21(х-6)=20(х+1)-36(х+2)

21х-126=20х+20-36х-72

21х-20х+36х=126+20-72

37х=74; х=2

2)3(х-5)/5+7(х+5)/6=4(7х+1,5)/15+1/3

3•6(х-5)+5•7(х+5)=2•4(7х+1,5)+10

18х-90+35х+175=56х+12+10

18х+35х-56х=12+10+90-175

-3х=-63; х=21

3)3(2х+5)/8-2(5х+7)/3=7(х-15)/4-6 7/8

3(2х+5)/8-2(5х+7)/3=7(х-15)/4-55/8

3•3(2х+5)-2•8(5х+7)=7•6(х-15)-3•55

18х+45-80х-112=42х-630-165

18х-80х-42х=112-630-165-45

-20х=-728; х=36,4