a) [tex]2x+5-\frac{3x-12}{3} =2x+5-(x-4)=2x+5-x+4=x+9[/tex]
b) [tex]\frac{12x+16}{4}-\frac{10x+15}{5}=3x+4-(2x+3)=3x+4-2x-3=x+1[/tex]
c) [tex]\frac{9-6x}{3}-\frac{21-14x}{7}=3-2x-(3-2x)=3-2x-3+2x=0[/tex]
d) [tex]\frac{4x-8}{2}-3*\frac{10x-50}{5}=2x-4-3*(2x-10)=2x-4-6x+30=-4x+26[/tex]
