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x=12-3,5
x=8,5
spr: 8,5+ 3,5= 12
G) 6,2+ x = -10
x= -10-6,2
x= -16,2
spr : -16,2+10 = 6,2
h )2,5+x=0
x=-2,5
spr : -2,5+2,5 = 0
i)-x=-11,7-0,35
-x=-12,05 / -1 (Obustronnie dziele przez -1 )
x=12,05
spr : 12,05-0,35= 11,70