X•8=720
X=720:8
X=90
90•8=720
720=720
420-y=210
y=420-210
y=210
420-210=210
210=210
1) x=720:8
x=90
2) y= 420-210
X•8=720
X=720:8
X=90
90•8=720
720=720
420-y=210
y=420-210
y=210
420-210=210
210=210
1) x=720:8
x=90
2) y= 420-210
y=210