360: х=15×4; 84: (36-х)=7 х+10×10=320 90×х-60=30

360÷x=15×4
360÷x=60
X= 360÷60
X= 6

360÷6=60
60=60

84÷(36-x)=8
(36-x)=84÷4
36-x=21
X=36-21
X=15

84÷(36-15)=8
8=8

X+10×10=320
X+100=320
X=320-100
X=220

220+10×10=320
320=320

90×x-60=30
90× X= 30+60
90×X= 90
X= 90÷90
X=1

90×1-60=30
30=30

360 ÷ х = 15 × 4
360 ÷ х = 60
х= 360 ÷ 60
х = 6
360 ÷ 6 = 15 × 4
60 = 60

84 ÷ ( 36 - х ) = 7
36 - х = 84 ÷ 7
36 - х =12
х = 36 - 12
х = 24
84 ÷ (36 - 24) =7
7=7

х +10 + 10 = 320

х + 20 = 320
х= 320 - 20
х = 300
300 + 10 +10 =320
320 = 320

90 ×х - 60 = 30
90 × х = 30 + 60
90 × х = 90
х = 90 ÷ 90
х = 1
90 × 1 - 60 = 30
30 = 30