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x+10-3
x=7
a+4=1+2a
-a=1-4
-a=-3/:-1
a=3
2x+3=10+x
2x-x=10-3
x=7
spr.2*7+3=10+7
17=17
L=P
b)
a+4=1+2a
a-2a=1-4
-a=-3/:(-1)
a=3
spr.3+4=1+2*3
7=7
L=P