[section 3][integers]

(1.) -3 + 6 here is the problem

= 3 add

result: 3

(2.) 2 + (-5) here is the problem

= -3 add

result: -3

(3.) (-3) + 7 here is the problem

= 4 add

result: 4

(4.) (-9) + 8 here is the problem

= -1 add

result: -1

(5.) (-7) + (-2) here is the problem

= -9 add

result: -9

(6.) -8 + 3 here is the problem

= -5 add

result: -5

(7.) 0 + (-9) here is the problem

= -9 add

result: -9

(8.) 9 + (-6) here is the problem

= 3 add

result: 3

(9.) 8 + (-7) here is the problem

= 1 add

result: 1

(10.) 8.6 + (-3.7) here is the problem

= 4.9 add

result: 4.9

(11.) 5 - (-9) here is the problem

= 5 + 9 minus minus means plus

= 14 add

result: 14

(12.) 6 - 11 here is the problem

= -5 subtract

result: -5

(13.) -10 - 10 here is the problem

= -20 subtract

result: -20

(14.) -4 - 5 here is the problem

= -9 subtract

result: -9

(15.) -6 - (-4) here is the problem

= -6 + 4 minus minus means plus

= -2 add

result: -2

(16.) 9 - 9 here is the problem

= 0 subtract

result: 0

(17.) 0 - 7.8 here is the problem

= -7.8 subtract

result: -7.8

(18.) 6.7 - (-12.3) here is the problem

= 6.7 + 12.3 minus minus means plus

= 19 add

result: 19

(19.) -8 - 4 here is the problem

= -12 subtract

result: -12

(20.) 16 - (-15) here is the problem

= 16 + 15 minus minus means plus

= 31 add

result: 31