1.5+(-7.9)+(-7.1)
1.5 + (-7.9) + (-7.1) = ?
---> Just pretend those decimals aren't there, and then solve.
-79 + (-71) = -150
-150 + 15 = -135
---> Add the decimal back when you are done solving, and there's your answer!
-135 --> -13.5
1.5 + (-7.9) + (-7.1) = -13.5
