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tomek....x-25=11.3
zosia....x+13=49
x+x+x+25+13=147
3x=147-38
3x=109 /:3
x=36.3
z+a+t=147-13+25
z+a+t=159/3
z+a+t=53
z=53+13=66
a=53
t=53-25=28
66+53+28=147