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Sagot :

DAVIDCOGNARD24

Explications étape par étape:

4x -6=7x-9

4x -7x=-9+6

-3x=-3

x=-1

3(x^2+2x +5)=x( x +1)

3x^2+6x +15=x^2+x

3x^2-x^2+6x-x+15=0

2x^2+5x+15=0

7x+8=-1+6x

7x-6x=-1-8

x=-9

(x+2)x=x(x-2)

x^2+2x=x^2-2x

x^2-x^2+2x+2x=0

4x=0

x=1/4

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