Question 517004
x, x+2, x+4
{{{(x+2)+(x+4)=20+x}}} add
{{{2x+6=20+x}}} subtract {{{x}}} from both sides 
{{{x+6=20}}} subtract {{{6}}} from both sides 
{{{x=14}}}
{{{14+2=16}}}
{{{14+4=18}}}
{{{highlight(14)}}}, {{{highlight(16)}}}, {{{highlight(18)}}}

check:
{{{16+18=34}}}
{{{34-20=14}}}
correct