1) -25/8*4/5x-25/8*3/25y+25/8*8z+15/2*2/3x+15/2*9/15y-15/2*10z= (-5/2+5)x+(3/8+9/2)y+(25-75)z=2.5x+4.875y-50z
2) -15.3a-13.6b+85c+670b-93.8c-120.6a=-135.9a+656.4b-8.8c
1) -25/8*4/5x-25/8*3/25y+25/8*8z+15/2*2/3x+15/2*9/15y-15/2*10z= (-5/2+5)x+(3/8+9/2)y+(25-75)z=2.5x+4.875y-50z
2) -15.3a-13.6b+85c+670b-93.8c-120.6a=-135.9a+656.4b-8.8c