-12+(-13) = -25-39+(-51) = -90-27+(-43) = -7017+(-50) = -3336+(-60) = -2441+(-73) = -32-7.3+(-8.1) = -15.46.5+3.2 = 9.7
-12+(-13) = -25
-39+(-51) = -90
-27+(-43) = -70
17+(-50) = -33
36+(-60) = -24
41+(-73) = -32
-7.3+(-8.1) = -15.4
6.5+3.2 = 9.7