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m=10/21
m=0,48
*3,5x+2=5,5
3,5x=3,5x
x=1
*0,2x+1=9
x=8/0,2
x=40
*1/4+x=17/20
x/4=17/20
20x=68
x=17/5
*2/7x-9/4=5/3
2x/7-9/4=5/3
24x-189=140
24x=329
x=24/329
x=13,71
*y=1/5-3/4
y=-9/20
y=-0,45