a+b+c=138 si a:5=x (rest y) ⇒ a=5x+y
b:6=x (rest y) ⇒ b=6x+y
c:7=x (rest y) ⇒ c=7x+y
⇅
a+b+c = 5x+y+6x+y+7x+y=138
18x+3y = 138 | :3
6x + y = 46
⇅
pt.x=0 => y=46 => a=5*0+46=46; b=6*0+46=46; c=7*0+46=46.
x=1 => y=40 => a=5*1+40=45; b=6*1+40=46; c=7*1+40=47.
x=2 => y=34 => a=5*2+34=44; b=6*2+34=46; c=7*2+34=48.
s.a.m.d.