Bonjour,
2+x=(1-3x)/7 <=> 7*(2+x)=1-3x
<=> 14+7x=1-3x
<=> 7x+3x=1-14
<=> 10x=-13
<=> x=-13/10=-1.3
5x-9/6=1-x <=> 5x+x=1+9/6
<=> 6x=6/6+9/6
<=> 6x=(9+6)/6
<=> 6x=15/6
<=> x=(15/6)*6=15
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Bonjour,
2+x=(1-3x)/7 <=> 7*(2+x)=1-3x
<=> 14+7x=1-3x
<=> 7x+3x=1-14
<=> 10x=-13
<=> x=-13/10=-1.3
5x-9/6=1-x <=> 5x+x=1+9/6
<=> 6x=6/6+9/6
<=> 6x=(9+6)/6
<=> 6x=15/6
<=> x=(15/6)*6=15