Junior high school, addition and subtraction of rational numbers. (- 7) - 9 - (- 3) + (- 5), - 4.2 + 5.7-8.4 + 10, (- 1.3) - (- 3.2), - 1 / 4 + 5 / 6 + 2 / 3-1 / 2 It's a process, please

Junior high school, addition and subtraction of rational numbers. (- 7) - 9 - (- 3) + (- 5), - 4.2 + 5.7-8.4 + 10, (- 1.3) - (- 3.2), - 1 / 4 + 5 / 6 + 2 / 3-1 / 2 It's a process, please

(-7)-9-(-3)+(-5)
=-7-9+3-5
=-16-2
=-18;
-4.2+5.7-8.4+10
=-4.2-2.7+10
=-6.9+10
=3.1
(-1.3)-(-3.2)
=-1.3+3.2
=1.9
-1/4+5/6+2/3-1/2
=-1/4+5/6+4/6-2/4
=-3/4+9/6
=-3/4+3/2
=-3/4+6/4
=3/4

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