7. 计算:
(1) $10 - (-6) + 8 - (+2)$;
(2) $-4 - (-5) + (-3)$;
(3) $-13 - (-22) + (-28)$;
(4) $(-15) + (+7) - (-3)$;
(5) $8 + (-10) + (-2) - (-5)$;
(6) $12 - (-16) + (-7) -14$;
(7) $(-3.14) + (+4.96) + (+2.14) + (-7.96)$;
(8) $(-26.54) - (-6.4) +18.54 -6.4$;
(9) $-\frac{3}{5} + \frac{3}{7} + \frac{2}{13} + \frac{4}{7} + \frac{3}{5}$;
(10) $-(-\frac{5}{6}) + (-8) - \frac{7}{10}$;
(11) $|-7| -4 + (-2) - |-4| + (-9)$;
(12) $(+\frac{3}{4}) - (-\frac{5}{4}) - |-3|$;
(13) $|6-5| + \left|-\frac{1}{6}\right| + \left|\frac{1}{2} - \frac{1}{3}\right| + \left|4 - \frac{2}{3}\right|$;
(14) $(-3\frac{2}{3}) - (-2\frac{3}{4}) - (-1\frac{2}{3}) - (+1.75)$;
(15) $(-4\frac{7}{8}) - (-5\frac{1}{2}) - (-4\frac{1}{4}) - (+3\frac{1}{8})$;
(16) $2\frac{1}{3} - (+3\frac{2}{5}) - (+8\frac{1}{3}) + (-8\frac{3}{5})$;
(17) $|-3.2| + |0-5| - \left|1 + 2\frac{1}{5}\right|$;
(18) $\left|-\frac{2}{3}\right| + \left|-\frac{1}{6}\right| - (+\frac{5}{6}) - \frac{1}{2}$.

(1)22 (2)-2 (3)-19 (4)-5 (5)1 (6)7 (7)-4 (8)-8 (9)$1\dfrac{2}{13}$ (10)$-7\dfrac{13}{15}$ (11)-12 (12)-1 (13)$4\dfrac{2}{3}$ (14)-1 (15)$1\dfrac{3}{4}$ (16)-18 (17)5 (18)$-\dfrac{1}{2}$