<span>7(3у - 5)=10(3 - 2у)
21y - 35 = 30 - 20y
21y + 20y = 30 + 35
41y = 65
y = 65 : 41
<u>y = 65/41</u>
</span>
1) 10000000+8000000+300000+50000+6000+100+70+2
2) 3000000+600000+3000+700
300/560=15/28
165/1320=1/8
168/525=8/25
512/1600=8/25
8(х+15)=360<span>
8х + 120 = 360
8х = 360 -120
8х = 240
х = 240 : 8
х = 30
или
</span><span>8(х+15)=360
</span>х +15 = 360 :8
х +15 = 45
х= 45 -15
х= 30
Мой вариант
2 3 12 8
15 11 13 1
10 6 5 9
7 14 4 16