Réponse:
1) 3/4x =5
{=} (3/4x) = 5
{=} 0,75x = 5
{=}. x = 5/0.75
{=}. x = 6.666677777
2) 4x-3 = 11
{=} 4x-3+3=11+3
{=} 4x = 14
{=} 4x/4 = 14/4
{=} x = 3,5
3) 7-8x= 56
{=} 7-8x-7 = 56-7
{=} 8x = 49
{=} 8x/8 = 49/8
{=} x = 6,125
4) 6x-4 = 3x+14
{=} 6x -4+4 = 3x +14+4
{=} 6x = 3x +18
{=} 6x-3x= 3x-3x + 18
{=} 3x = 18
{=} 3x/3 = 18/3
{=} x = 6
5) 9-2x = 11+4x
{=} 9-2x-9= 11+4x-9
{=} 2x= 2+4x
{=} 2x-4x = 2+4x-4x
{=} -2x = 2
{=} -2x/-2 = 2/-2
{=} x = -1
Explications étape par étape:
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