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6*(-3)+4*(-2)+15= -18+(-8)+15= -36+15= -21
15-2*(-5)= 15-(-10)= 15+10= 25
14-3*(-2)+4*(-15)= 14-(-6)+(-60)= 14+6+(-60)= 20+(-60)= -40
6x(-3)+4x(-2)+15=-18-8+15=-26+15=-11
15-2x(-5)=15+10=25
14-3x(-2)+4x(-15)=14+6-60=20-60=-40