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x = 41,79
100x = 4179,79
100x-x = 4179,79 - 41,79
99x = 4138 / : 99
x = 4138/99
b)2,1(52)
x = 2,152
1000x =2152,152
1000x - x = 2152,152 - 2,152
99x = 2150 /: 99
x = 2150/99