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1/2x+2,5 = -3 +6x
2,5 +3 = 6x-1/2x
5,5 = 5,5 x //: 5,5
1=x
½x+⁵/₂=-3+³/₂x
0,5x+2,5=-3+1,5x
-x=-5,5 /:-1
x=5,5
-⅙x=-2½ obustronnie mnożone przez -6
x=15