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b)....=14x+10-6x+12= 8x+22
c)...=-16x+2x^2-5x^2-15x=-3x^2-31x
d...=15-10x-12x+18=-22x+33
e..=2x+5-x+4=x+9
f..=3x+4-2x-3=x+1
g=3-2x-3+2x=0
h..=2x-2-6x+30=-4x+28