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−aVn-aV_n−aVn*1/-a=b
−aVn-aV_n−aVn 1/-a=b
VnV_nVn=b/-a
VVV_n=aVn=aV_n=aVn+b −aVn-aV_n−aVn=b vnv_nvn=ab
donc VVV_n=2Vn=2V_n=2Vn+b
x=2x+5 -x=5 x=-5
je bascule le x de lautre coté
=-5 dsl
VnV_nVn=5
vnv_nvn=b