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b)-8y=5/-8
y=-5/8
d)2(x-1/2)-x+3=3
2x-1-x+3=3
2x-x=3-3+1
x=1
e)2(u-5)+15=2(u-4)+10
2u-10+15=2u-8+10
2u-2u=10-15-8+10
0=-23 sprzeczne
x-4/5=0.8
x=0,8+0,8
x=1,6