18m-5=553
18m=553+5
18m=558
m=558:18
m=31:
300-6k=48
6k=300-48
6k=252
k=252:6
k=42
<span>1.5х+1.5 * 2/3х=12
1 1/2x+3/2*2/3x=12
1 1/2x+x=12
2 1/2x=12
x=12:5/2
x=24/5
x=4 4/5
X=4,8
</span>
2,3y+2,5y+31=67
2,3y+2,5y=67-31
4,8y=36
y=7,5
237, 273, 327, 372, 723, 732
237+273+327+372+723+732 = 2664