Explicação passo-a-passo:
x = -2,166...
10x = -21,66...
100x = -216,66...
100x - 10x = -216,66... - (-21,66...)
90x = -195
x = -195/90
x = -13/6
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Explicação passo-a-passo:
x = -2,166...
10x = -21,66...
100x = -216,66...
100x - 10x = -216,66... - (-21,66...)
90x = -195
x = -195/90
x = -13/6