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5x=3*7
5x=21/:5
x=4⅕
2)8/3,5=4/y
8y=3,5*4
8y=14/:8
y=1¾
3)5/6=1+t/10
6(1+t)=5*10
6+6t=50
6t=50-6
6t=44/:6
t=7⅓
4)1/z-1=6,5/8
6,5(z-1)=1*8
6,5z-6,5=8
6,5z=8+6,5
6,5z=14,5/:6,5
z=23/13
5)2x-5/3=4/5
5(2x-5)=4*3
10x-25=14
10x=14+24
10x=39/:10
x=3,9
6)10/1,5=8/9-3x
10(9-3x)=8*1,5
90-30x=12
-30x=12-90
-30x=-78/:-30
x=2 18/30