Diketahui a=-3,b=4,c=-5 nilai (2a+3b-c)-ca-2b+3c)=

2(-3)+3(4)-(-5) - (-5(-3)) - 2(4)+ 3(-5)

=-6 + 12 + 5 - ( 5 . 3) - 8 + (-15)

= -6 + 12 + 5 -15 - 8 - 15
= 17 - 42
= -25