The answer would be 5/8 and 0.625 in decimal form.
1/-4 - 1/2 * 7/-4 (divide then multiply)
1/-4 - 1 * 7 over 2 * -4 (multiply)
1/-4 - 7 over 2 * -4 (simplify 1 * 7 to 7)
1/-4 - 7/-8 (simplify 2 * -4 to -8)
1/-4 - (7/-8) (move the negative sign to the left)
1/-4 + 7/8 (simplify brackets)
5/8 (simplify).