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Explicação passo a passo:

[tex]-3/4-\left[5/8+3-\left(3/2+2\right)-1/2\right]\\\\-3/4-\left(-\frac{3}{8}\right)\\\\\frac{-3}{4}-\left(-\frac{3}{8}\right)\\\\-\frac{3}{8}[/tex]