Réduire chaque expression.

a. 6x+4-8x²-7x+5+3x²=

b. -3a+5a²-2a-3-7a²+3=

c. 3x²-(6x-2x²+1)+(x²-5x)=

d. -(2a+1)+4a²+6-(-3a²+a)=

e. 7-x+(3x²-1)-(-3x+2x²)=

f. 4x-x²-(5-2x)+(6x²-7)=

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