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a) 20+(3x-4)= 20+3x-4=3x+16
b)8x^2-6-(5-7x^2)=8x^2-6-5+7x^2=15x^2-11
C)10a^2-(-a^2-4a+5)=10a^2+a^2+4a-5=11a^2+4a-5
d)5x+(7x-12)-(20+4x)= 5x+7x-12-20-4x=8x-32
e)8x+(-0,5x)-(-1,2x)=8x-0,5x+1,2x=8,7x
f)(1/3y+1/2x)-(4/3y-3/2x)=1/3y+1/2x-4/3y+3/2x=
-3/3y+4/2x ou -1y+2x
b)8x^2-6-(5-7x^2)=8x^2-6-5+7x^2=15x^2-11
C)10a^2-(-a^2-4a+5)=10a^2+a^2+4a-5=11a^2+4a-5
d)5x+(7x-12)-(20+4x)= 5x+7x-12-20-4x=8x-32
e)8x+(-0,5x)-(-1,2x)=8x-0,5x+1,2x=8,7x
f)(1/3y+1/2x)-(4/3y-3/2x)=1/3y+1/2x-4/3y+3/2x=
-3/3y+4/2x ou -1y+2x
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