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5x-4,9=0,2*0,5x
5x-4,9=0,1x
5x-0,1x=4,9
4,9x=4,9 /:4,9
x=1
49/10 x= 4,9 /*10
49x= 49
x=1
5x-4.9=2.5x-2.45*20%
5x-4.9=0.5x-0.49
5x-0.5x=-0.49+4.9
4.5x=4.41 /:4.5
x=0.98
Odp. Jest to 0.98.