Помогите с уравнениями,они простые: y:60=640:8
t-(7800-3900)=2000
y+600=720*3
9000-a=894+2000
m-3600=190*10
n-268=2700:3
a+4700=240*20
d+581=350*4
x-(4890:15)=380
y+(2700:9)=60*5
67080-y=210*50
a+878=479*4
15+(90-a):33=17
90*(a-8)+40=490
(14-x)*4-8=20
a*(100-83)=17
y:(55+45)=2
m+3010=4001*4
3780-y=2700:3
c+14*70=3000
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